Sources
Q1 – [WTO] – Market access for goods - gateway
https://www.wto.org/english/tratop_e/markacc_e/markacc_e.htm
Last accessed: 05.09.2026
Supports the mechanism that lower trade barriers (tariff and non-tariff measures) enable firms to enter foreign markets and access larger customer bases.
"Market access for goods in the WTO means the conditions, tariff and non-tariff measures, agreed by members for the entry of specific goods into their markets."
"Tariff commitments for goods are set out in each member’s schedules of concessions on goods. The schedules represent commitments not to apply tariffs above the listed rates — these rates are 'bound'."
Q2 – [WTO] – Understanding the WTO: Principles of the trading system
https://www.wto.org/english/thewto_e/whatis_e/tif_e/fact2_e.htm
Last accessed: 05.09.2026
Supports the mechanism that when a country lowers a trade barrier, it opens markets for all trading partners, expanding access to foreign markets.
"In general, MFN means that every time a country lowers a trade barrier or opens up a market, it has to do so for the same goods or services from all its trading partners — whether rich or poor, weak or strong."
"With stability and predictability, investment is encouraged, jobs are created and consumers can fully enjoy the benefits of competition — choice and lower prices."
Q3 – [WTO / OECD] – Aid for Trade at a Glance 2015: Reducing Trade Costs for Inclusive, Sustainable Growth, Chapter 1
https://www.wto.org/english/res_e/booksp_e/aid4trade15_chap1_e.pdf
Last accessed: 05.09.2026
Supports the mechanism that reducing trade costs allows firms to overcome frictions, enter foreign markets, and access larger customer bases.
"High trade costs effectively nullify comparative advantage by rendering exports uncompetitive."
"High trade costs deny firms access to technology and intermediate inputs, preventing their entry into, or movement up, global value chains. High trade costs also erode consumer welfare narrowing the range of good and services on offer and pushing up prices. While trade costs do not alone explain the development pathways of economies, they are a major factor explaining why some countries are unable to grow and diversify."
"access to foreign inputs has been found to be associated with innovation activity: as firms gain access to competitively priced goods from abroad."
"High trade costs price some country regions, countries and companies out of export markets, thereby limiting their"
"Poor producers who are involved in producing export goods benefit from lower trade costs because their production becomes more competitive on world markets, so they can expand."
Q4 – [WTO / OECD] – Aid for Trade at a Glance 2015: Reducing Trade Costs for Least Developed Countries, Chapter 5
https://www.wto.org/english/res_e/booksp_e/aid4trade15_chap5_e.pdf
Last accessed: 05.09.2026
Supports the mechanism that reducing trade costs is essential for firms—especially SMEs in LDCs—to remain competitive in international markets, and that higher trade costs disproportionately disadvantage smaller firms.
"the imperative to reduce trade costs to become and remain competitive in the international and regional markets is well documented."
"Since these firms are unlikely to achieve economies of scale and the level of competitiveness that is required to survive in the global market, their survival rate in the international market tends to be much lower compared to the enterprises in advanced countries."
"competitive in the international and regional markets is well documented. However, this is more urgent in the context of the LDCs, where most of the exporting firms are Small and Medium-sized Enterprises (SMEs), where trade costs are"
"Due to limited and uncertain revenues, including export earnings, the burden of higher trade costs converted into percentage terms disproportionately disadvantages the SMEs."
"According to the study, firms from the LDCs comprised SMEs whose export values were relatively low. These firms exported much fewer products, with most of them exporting just one product to a single market."
"Fernandes et al. (2013) point out, firms in a large majority of LDCs, where the market size is small, are likely to be SMEs."
"have undertaken anyway (see Chapter 4 for further detail). Moreover, availability of various financing facilities for the implementation of the Agreement means that LDCs are more likely to make use of such opportunities for this purpose."
Q5 – [WTO / OECD] – Aid for Trade at a Glance 2015: Chapter 1 (WHY TRADE COSTS MATTER FOR INCLUSIVE, SUSTAINABLE GROWTH)
https://www.wto.org/english/res_e/booksp_e/aid4trade15_chap1_e.pdf
Last accessed: 05.09.2026
Supports the mechanism that trade costs create frictions that prevent firms from entering export markets, accessing inputs, and realizing comparative advantage.
"International trade is not a seamless process. 'Frictions' abound that give rise to trade costs."
"High trade costs effectively nullify comparative advantage by rendering exports uncompetitive."
"High trade costs deny firms access to technology and intermediate inputs, preventing their entry into, or movement"
"access to foreign inputs has been found to be associated with innovation activity: as firms gain access to competitively priced goods from abroad."
"Some 87.0% of the 62 developing and least developed country respondents indicated that trade costs are very important for their export competitiveness. A higher number, 91.9%, believed that trade costs were important or very important for access to imports."
"In addition, poor and non-competitive infrastructure (e.g. telecommunications) and inadequate financial services inhibit the ability of services providers to efficiently deliver and advertise services."
"Some countries limit competition in some aspects of their maritime services sectors, such as cabotage (movement between domestic ports), with resulting increases in trade costs."
"According to the UNECA response to the 2015 monitoring exercise: 'Reductions in trade costs can support economic diversification, this effect depends, however, on the supply-response of the private sector; hence the diversification is ultimately contingent on private sector skills and capabilities, as well as on the broader industrial policy framework.'"
Q6 – [OECD] – Removing Barriers to SME Access to International Markets
https://www.oecd.org/content/dam/oecd/en/publications/reports/2008/04/removing-barriers-to-sme-access-to-international-markets_g1gh90c7/9789264045866-en.pdf
Last accessed: 05.09.2026
Supports the mechanism that trade agreements and reduced barriers enable SMEs to access international markets, but SMEs face specific obstacles.
"Entrepreneurs are focusing more on international business as global communications and transportation become more efficient and as trade agreements pry open national markets to foreign competition."
"This is consistent with the global spread of large firm exports. In 2001, 63% of SME exporters traded with only one other country, while 54% of large firms exported goods to five or more foreign markets."
"A number of internal and external barriers prevent SMEs from competing in the global market. In response, almost all economies currently provide a package of support services and programmes designed to help firms to overcome these barriers."
"Although SMEs are a major source of growth and job creation, SMEs appear to be under-represented in the international economy relative to their contribution in national and local economies."
"Two original OECD-APEC surveys investigated how SME policy makers and SMEs perceive the barriers to SME access to international markets."
"Data from: Table 1.4. Top ten barriers to SME access to international markets."
"which was endorsed by the conference participants, building on the lessons learned regarding both the barriers and policy responses."
"It exposes the SME to international best practice, knowledge and technology through greater experience of the competitive pressures of the international trading environment (MED, 2002)."
"The numerous benefits to SMEs engaged in international trade are well documented, with a considerable body of evidence that international trading activity stimulates increased productivity growth by strengthening competition and innovation and increasing access to new ideas and technology (DTI, 2006a)."
"International trading activity enables businesses to achieve growth and economies of scale which domestic markets"
"It exposes the SME to international best practice, knowledge and technology through greater experience of the competitive pressures of the international trading environment (MED, 2002). The emergence of transnational production systems enables the disaggregation of value chains and advances in information and communications technology (ICT) reduce barriers and costs associated with distance."
Q7 – [WTO / OECD] – Trade Facilitation Indicators (TFA) – TAD/TC/WP(2018)24/FINAL
https://www.wto.org/english/tratop_e/msmes_e/oecd_tf_paper.pdf
Last accessed: 07.09.2026
Supports the mechanism that trade facilitation reduces trade costs and helps SMEs access international markets.
"Agreement (TFA) should help SMEs better access international markets by increasing the transparency and efficiency of customs and other administrative procedures."
"Indeed, implementation of the TFA is expected to benefit both developed and developing countries, reducing trade costs by 10% to 18% respectively."
"Source: OECD (2015b). Note: 1About 40% of those indirect exports occurred via other SMEs. Around half (54%) of SMEs’ exports in value added terms is exported directly to foreign markets, but 18% reflects indirect exports through other SMEs and another 28% reflects exports via large firms."
"External challenges relate to the environment firms face when getting products to foreign markets. These encompass a range of factors relating to the business environment, logistics and regulations, many of which can be trade-related."
"These are well documented in the literature (see, for example, WTO (2016) and OECD (2017)). External challenges relate to the environment firms face when getting products to foreign markets."
Q8 – [WTO] – World Trade Report 2008, Chapter II: Distributional Consequences of Trade
https://www.wto.org/english/res_e/booksp_e/anrep_e/wtr08-2e_e.pdf
Last accessed: 07.09.2026
Supports the mechanism that trade liberalization simultaneously increases export opportunities and import competition, with heterogeneous firm effects.
"Unilateral trade liberalization would raise the degree of competition in the local market (by allowing more firms to enter), thereby depressing market shares and profits."
"Having an economy that is open to trade implies both the opportunity to sell goods and services to foreign markets as well as an additional source of competition from abroad."
"Such a liberalization yields selection and share-shifting effects that are favourable to large, export-oriented firms and detrimental to small, domestic-oriented firms. The former will support it, the latter will oppose it."
"In practice, import subsidies are rarely observed"
Q9 – [WTO] – Trade Remedies: Safeguarding Domestic Industries
https://www.wto.org/english/thewto_e/acc_e/tls_e/wtacctls32_leg_10.pdf
Last accessed: 07.09.2026
"The primary objective of trade remedies is the provisional safeguarding of domestic industries."
"By temporarily increasing import duties or implementing quantitative restrictions like quotas, governments shield local industries from the competitive challenges posed by imports."
"They can only stay in place for as long as the domestic industry of the importing country is at risk of injury or as long as the unfair trade practices continue."
"industries struggling in the face of increasing imports following the process of trade liberalization."
"These mechanisms, crucially, allow governments to address political pressures arising from heightened competition due to trade liberalization."
Q10 – [IMF] – International Trade: Commerce among Nations
https://www.imf.org/en/publications/fandd/issues/series/back-to-basics/trade
Last accessed: 05.09.2026
Supports the mechanism that import competition from foreign firms forces less efficient domestic firms to contract.
"The increase in competition coming from foreign firms puts pressure on profits, forcing less efficient firms to contract and making room for more efficient firms."
"Usually, however, the buyer gains more than the domestic seller loses. Except in cases in which the costs of production do not include such social costs as pollution, the world is better off when countries import products that are produced more efficiently in other countries."
"Those who perceive themselves to be affected adversely by foreign competition have long opposed international trade."
Q11 – [IMF Working Paper WP/04/28] – Trade Liberalization and Firm Productivity: The Case of India
https://www.imf.org/external/pubs/ft/wp/2004/wp0428.pdf
Last accessed: 05.09.2026
Supports the mechanism that opening local markets to foreign competition increases competitive pressure on domestic firms.
"Over the past two decades, trade liberalization has become an important part of many countries’ development strategies."
"Advocates of liberalization argue that opening up local markets to foreign competition and foreign direct investment can lead to improvements in the productivity of domestic industries, resulting in a more efficient allocation of resources and greater overall output."
"Critics warn that domestic firms may not be able to realize efficiency gains, because they are unable to successfully adapt foreign technologies to local methods of production or because domestic firms face binding credit constraints that prevent expansion of efficient industries as well as investments in new technology."
"Because there are both public and private firms operating in most industries in India, we can compare how the productivity of public and private companies changes with increased competition from imported goods."
"This estimate captures the cumulative effect of all changes in the economic environment in which firms operate after trade reforms."
Q12 – [WTO] – World Trade Report 2024
https://www.wto.org/english/res_e/booksp_e/wtr24_e/wtr24_e.pdf
Last accessed: 07.09.2026
"Lowerpriced imports lifted household purchasing power, especially at the bottom of the income distribution."
"Similarly, the lower prices and consumer choice that come with trade openness can effectively increase the purchasing power of low- and middle-income consumers."
"benefit as much from the lower prices associated with trade openness because of high domestic trade costs and intermediaries' market power."
"measures such as export restrictions on food tend to be ineffective in shielding low-income consumers from external shocks because they can discourage farmers from producing more food, ultimately leading to shortages and higher costs for everyone, including the poor."
"Competition policy to address excessive market power of certain large firms can help to ensure that consumers benefit from lower prices due to trade openness."
"Globalization also increased productivity within sectors by increasing the size of the markets that firms can access, thus fostering economies of scale and boosting the incentive to innovate, by intensifying competition in the domestic economy and facilitating access to foreign technology, knowledge, know-how and to a larger variety of intermediate inputs of higher quality or at cheaper prices."
"Improved access to imported intermediate inputs can enhance productivity within domestic firms and industries."
"By incorporating high-quality materials, components, services and technologies from abroad, businesses can streamline their production processes, improve product quality and reduce costs."
"Cheaper access to foreign intermediate inputs also raises the relative return to using modern technologies which incentivizes their adoption."
"Finally, access to a larger variety of intermediate inputs helps firms to introduce new products."
"Trade has raised aggregate welfare and reduced poverty without necessarily raising inequality in many economies, but the impact of trade is more complex for individuals. People may benefit from cheaper prices, larger variety and export opportunities, but they may also face increased competition and may, therefore, either gain or lose from trade."
"Similarly, the larger benefits on low-income consumers from tariff removal can, in some cases, more than offset wage losses, thereby reducing inequality."
"Trade can significantly reduce child labour by increasing incomes and lowering prices."
"Trade leads to substantial welfare gains by making a cheaper, more diverse set of products available to consumers."
"Trade's large welfare gains through consumption have substantial redistributive effects and can counter inequality-increasing effects on the labour market."
"Consumers in low-income households tend to benefit more from trade openness."
"Due to their relative higher spending on imported products, poor households are estimated to experience approximately twice the consumption-related gains from trade compared to rich households, which tend to consume more non-traded services."
"However, by focusing on import competition, often from a single trade partner, such studies fail to account for the multitude of channels through which trade affects individuals and regions, including export opportunities, access to cheaper inputs and lower consumption prices."
"US lowest-income households experienced welfare gains 57 per cent larger than the US highestincome households after China's accession to the WTO."
"Consumption gains from trade tend to favour the poorer segments of the population in developing economies more."
"Trade-opening has been found to lower prices particularly for goods consumed by poorer households in some emerging economies."
"Low-income households in developing economies benefit disproportionately from trade-opening because they spend a larger share of their budget on food items, which are subject to comparatively high tariffs."
"in Switzerland, a sudden decrease in import prices was shown to increase welfare for lower-income households by about 30 per cent more than higherincome households, because lower-income households adjusted their expenditure more."
"the poorest US households would gain four and a half times more than the richest households from a 10 per cent reduction in US import costs due to higher price sensitivities."
"High levels of market power enable firms not to pass lower costs on to workers and consumers, and also reduce the ability of workers to move towards opportunities."
"SOEs may also limit the pass-through of cost savings to consumer prices after tariff liberalization due to their lower sensitivity to costs."
"High internal trade costs mute the impact of trade on prices and limit access to export opportunities."
Q13 – [World Bank Economic Review] – Infrastructure, Geographical Disadvantage, Transport Costs, and Trade
https://documents1.worldbank.org/curated/en/662351468331778084/pdf/773650JRN020010aphical0Disadvantage.pdf
Last accessed: 07.09.2026
Supports the economic-geography mechanism that formal market access does not equal practical market access, showing how geography, distance, transport costs, and infrastructure influence effective participation in international trade.
"The real costs of trade—the transport and other costs of doing business internationally—are important determinants of a country’s ability to participate fully in the world economy."
"Remoteness and poor transport and communications infrastructure isolate countries, inhibiting their participation in global production networks."
"As liberalization continues to reduce artificial trade barriers, the effective rate of protection provided by transport costs is now, in many cases, considerably higher than that provided by tariffs."
"A deterioration of infrastructure from the median to the 75th percentile raises transport costs by 12 percentage points and reduces trade volumes by 28 percent."
"For coastal economies, own infrastructure explains 40 percent of the predicted cost; for landlocked countries, own infrastructure explains 36 percent and transit infrastructure 24 percent of the cost."
"An extra 1,000 km by sea adds $190, whereas a similar increase in land distance adds $1,380."
"Being landlocked raises costs by $3,450—compared with a mean cost for nonlandlocked countries of $4,620."
"Poor infrastructure accounts for 40 percent of predicted transport costs for coastal countries and up to 60 percent for landlocked countries."
"An improvement in own and transit countries’ infrastructure from the 25th percentile to the 75th percentile overcomes more than half of the disadvantage associated with being landlocked."
"We find that this elasticity is large, with a 10-percentage-point increase in transport costs typically reducing trade volumes by approximately 20 percent."
Graphic Sources
VG1 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Fictional Region A with one domestic company in the center. A previously restricted connection to Regions B and C opens. Arrows simultaneously lead outward toward foreign customers and inward toward Region A. Minimal labels: “New Markets” and “New Competition”.
VG2 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Fictional Region A containing several companies and customers. Regions B and C are visible outside it, but connections between the regions are weak and costly. Region A’s companies primarily serve their domestic market.
VG3 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Same fictional map. Connections between Region A and Regions B and C become stronger. Company A now has arrows reaching customer groups across all three regions. The accessible customer area visually expands.
VG4 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Company A develops from a small production facility serving Region A into a larger facility supplying Regions A, B and C. Simple visual progression: more customers → more production → potential economies of scale.
VG5 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Return to the map from Folie 3. The existing arrows from Company A toward Regions B and C remain, but new arrows now lead from companies in B and C toward customers in Region A.
VG6 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Split comparison. Before: three domestic companies competing for customers in Region A. After: the same domestic market contains those companies plus several foreign competitors, while domestic companies can simultaneously reach customers abroad.
VG7 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Two fictional companies after market opening. Company A expands production and exports to several regions. Company B remains focused on its domestic market and loses part of its customer base to new competitors.
VG8 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Before-and-after view of a fictional store shelf. Before: a small selection of domestic products. After: a larger mixture of domestic and imported products. A subtle downward price indicator appears beside some products.
VG9 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Two companies inside the same fictional country. Company A is located near a major railway and port. Company B is far inland with a long road connection before reaching the same port. Both point toward the same foreign market.
VG10 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Parallel supply routes. Company A → short rail connection → port → foreign market. Company B → long road journey → rail transfer → port → same foreign market. Transport-cost indicators rise along the second route.
VG11 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Four fictional companies combining two dimensions: strong or weak international competitiveness and good or poor transport connectivity. Their resulting international reach differs visually through the number and strength of trade connections.
VG12 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Central fictional global market network. One side shows expanding customer connections, larger markets and growing production. The other shows incoming competitors and pressure on domestic companies. Transport networks underneath connect both sides.
VG13 – AI-generated image
Created with OpenAI DALL·E (text-to-image model),
based on a custom prompt by the author.
Final overview of the fictional world with several regions, companies, consumers, ports, railways and international trade flows. Some companies expand, others remain small, and consumers receive products from multiple regions. Minimal central text: “Same Change. Different Effects.”