The authors of this study challenge the assumptions of the World Bank that the expansion in informal cross-border trade is a vindication of the market-liberalizing thrust of structural adjustment, and that adjustment policies have improved the effectiveness of an "independent" bourgeoisie that is emerging out of this trade as an agent of regional integration. Instead, they make the case for the adoption of what they call a "development approach" for tapping the benefits of the informal currency markets, as an alternative to the "market coercion" of structural adjustment.

The paper reviews recent theoretical and empirical developments in the analysis of informal currency markets in developing countries. The basic characteristics of these markets are highlighted, and alternative analytical models to explain them are discussed. The implications for exchange rate policy —including imposition of foreign exchange restrictions, devaluation, and unification of exchange markets— in countries with a sizable parallel market are also examined.

Some central banks have maintained overvalued official exchange rates, while unable to ensure that supply of foreign exchange meets legitimate demand for current account transactions at that price. A parallel exchange rate market develops, in such circumstances; and when the spread between the official and parallel rates is both substantial and sustained, price levels in the economy typically reflect the parallel market exchange rate. “Recognizing reality” by allowing economic agents to use a market clearing rate benefits economic activity without necessarily leading to more inflation. But a unified, market-clearing exchange rate will not stabilize without a supportive fiscal and monetary context. A number of country case studies are included; my thanks to Jie Ren for pulling together all the data for the country case studies, and the production of the charts.

This paper provides a theoretical framework to understand the way in which exchange controls modify the behavior of the different agents in the economy, leading to the creation of a parallel market economy. It gives the necessary theoretical elements to analyze this parallel market economy and provides a simple methodology to obtain relevant quantitative information about it. Finally, the paper elaborates on some of the policy implications of the existence of a parallel market economy. The model developed shows that the parallel market activities can be explained through the optimizing behavior of exporters and importers, which determines the amount of import and export smuggling, the level of the rent-seeking activity, and the black market exchange rate that is consistent with an equilibrium position where no one has any more incentives to move from their attained position. A method to detect the presence, and assess the magnitude of the parallel market economy, as well as to explain its behavior quantitatively, is then developed and applied to the case of Ghana.

The evidence of black market exchange rate systems and their impact on macroeconomic performance is well documented in this fully researched study of the problem. The book offers policy conclusions after assessing the evidence.

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Informal cross-border trade (ICBT) represents a prominent phenomenon in Africa. Several studies suggest that for certain products and countries, the value of informal trade may meet or even exceed the value of formal trade. This paper provides a review of existing efforts to measure informal trade. We list 18 initiatives aimed at measuring ICBT in Africa. The paper also summarizes discussions conducted with many stakeholders in Africa between December 2016 and May 2018 regarding the measurement, the determinants, and the implications of ICBT. The methodologies used to measure ICBT in Africa differ widely, but they do confirm that informal trade in Africa is both sizeable and volatile. Both evidence on the determinants of ICBT and discussions with stakeholders suggest that policies should aim to reduce the existing costs associated with formal trade and provide positive incentives for traders and producers to move into the formal economy in order to avoid the loss of economic potential stemming from informal trade.