Low-income countries are often advised to prioritize investment in their trade infrastructure to better connect to international markets, and garner the benefits of a more open trade regime. The World Bank’s Trade Facilitation Support Program and the World Trade Organization (WTO)’s Trade Facilitation Agreement, for example, promote investment in trade infrastructure to boost development prospects by improving competitiveness and lowering trade costs.
In a recent ADB Institute working paper , I posed the question of whether too much emphasis may have been placed in recent years on international trade infrastructure such as ports, customs, and international logistics that reduce international trade costs to the detriment of domestic infrastructure—internal roads and bridges that may reduce domestic trade costs.
Much of the empirical research shows that investment in trade infrastructure has a strong and positive impact on trade flows, and there is also a consensus that trade is an engine for economic growth. So, investment in trade infrastructure seems like a step in the right direction.
However, as anyone who has experienced rush hour traffic in an Asian megacity recently would know, the main infrastructure development challenges facing developing countries are not necessarily found at the border. Investment in domestic infrastructure is often lagging investment in trade infrastructure. This mismatch can hurt a country’s development prospects by undermining its potential to develop domestic as well as international trade.
Building on a location model  developed by Martin and Rogers and using a new dataset on trade costs  made available by Arvis et al., I demonstrate that in countries where domestic physical infrastructure is worse than the trade infrastructure, the additional dollar should be invested in domestic infrastructure before further investments are made in international infrastructure.
More specifically, in countries with relatively poor domestic infrastructure, I found that a 1% increase in the ratio of domestic to international trade costs—which can be achieved by curbing international trade costs by 1%—leads to 0.44% reduction in GDP per capita. In countries with relatively good domestic infrastructure, the same investment in international trade costs leads to a 0.33% increase in GDP per capita.
Openness to international trade has, on average, had a positive impact on economic growth. But not all countries have benefited to the same degree. While investments in international trade facilitation no doubt lead to more trade, they can also result in a reallocation of investors away from countries with relatively poor domestic infrastructure.
The logic is straightforward. Firms deciding where to locate their production will choose countries with better domestic infrastructure, as it will be cheaper to produce goods and services there. Improved international trade infrastructure magnifies the opportunities for industrial relocation of firms to countries with decent domestic infrastructure.
This suggests that international mechanisms such as the WTO’s Trade Facilitation Agreement should make allowances for low-income countries to first develop their domestic infrastructure, so they can maximize the benefits to be had from more open trade.
Of course, there are many unanswered questions. The development impact of investment in national infrastructure as opposed to international trade infrastructure is unlikely to be linear, given that there’s more to development that just economic growth.
Further work should explore this question, as well as the impact of a range of possible trade-offs on investments in infrastructure. These include quality versus quantity, maintenance versus new infrastructure, financing with user fees versus subsidies, or universal services versus cost efficiency. The answers to these questions are likely to depend on the country, its development objectives, and the type of investment.