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 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.

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.

3. Investing in people.

The multiple indicator-multiple cause (MIMIC) method is a well-established tool for measuring informal economic activity. However, it has been criticized because GDP is used both as a cause and indicator variable. To address this issue, this paper applies for the first time the light intensity approach (instead of GDP). It also uses the Predictive Mean Matching (PMM) method to estimate the size of the informal economy for Sub-Saharan African countries over 24 years. Results suggest that informal economy in Sub-Saharan Africa remains among the largest in the world, although this share has been very gradually declining. It also finds significant heterogeneity, with informality ranging from a low of 20 to 25 percent in Mauritius, South Africa and Namibia to a high of 50 to 65 percent in Benin, Tanzania and Nigeria.

Africa is working toward the goal of creating a common currency that would serve as a symbol of African unity. The advantages of a common currency include lower transaction costs, increased stability, and greater insulation of central banks from pressures to provide monetary financing. Disadvantages relate to asymmetries among countries, especially in their terms of trade and in the degree of fiscal discipline. More disciplined countries will not want to form a union with countries whose excessive spending puts upward pressure on the central bank's monetary expansion. In T he Monetary Geography of Africa, Paul Masson and Catherine Pattillo review the history of monetary arrangements on the continent and analyze the current situation and prospects for further integration. They apply lessons from both experience and theory that lead to a number of conclusions. To begin with, West Africa faces a major problem because Nigeria has both asymmetric terms of trade—it is a large oil exporter while its potential partners are oil importers—and most important, large fiscal imbalances. Secondly, a monetary union among all eastern or southern African countries seems infeasible at this stage, since a number of countries suffer from the effects of civil conflicts and drought and are far from achieving the macroeconomic stability of South Africa. Lastly, the plan by Kenya, Tanzania, and Uganda to create a common currency seems to be generally compatible with other initiatives that could contribute to greater regional solidarity. However, economic gains would likely favor Kenya, which, unlike the other two countries, has substantial exports to its neighbors, and this may constrain the political will needed to proceed. A more promising strategy for monetary integration would be to build on existing monetary unions—the CFA franc zone in western and central Africa and the Common Monetary Area in southern Africa. Masson and Pattillo argue that the goal of a creating a s