Experience in other countries shows that circa 15% of the money "floats" in the recipient country and is used to finance consumption. This should translate to 1 billion free floating dollars in the hands of the 2 million citizens of Macedonia. Billions are transferred to the outside world (mostly to finance additional transactions, some of it to be saved in foreign banks away from the long hand of the state). A trickle of money comes back and is "laundered" through the opening of small legal businesses.
These are excellent news for Macedonia. It means that when the macro-economic, geopolitical and (especially) the micro-economic climates will change - billions of USD will flow back to Macedonia. People will bring their money back to open businesses, to support family members and just to consume it. It all depends on the mood and on the atmosphere and on how much these people feel that they can rely on the political stability and rational management. Such enormous flows of capital happened before: in Argentina after the Generals and their corrupt regime were ousted by civilians, in Israel when the peace process started and in Mexico following the signature of NAFTA, to mention but three cases. These reserves can be lured back and transform the economy.
But the black economy has many more important functions.
The black economy is a cash economy. It is liquid and fast. It increases the velocity of money. It injects much needed foreign exchange to the economy and inadvertently increases the effective money supply and the resulting money aggregates. In this sense, it defies the dictates of "we know better" institutions such as the IMF.
It fosters economic activity and employs people. It encourages labour mobility and international trade. Black economy, in short, is very positive. With the exception of illegal activities, it does everything that the official economy does - and, usually, more efficiently.
So, what is morally wrong with the black economy? The answer, in brief: it is exploitative. Other parts of the economy, which are not hidden (though would have liked to be), are penalized for their visibility. They pay taxes.
Workers in a factory owned by the state or in the government service cannot avoid paying taxes. The money that the state collects from them is invested, for instance, in infrastructure (roads, phones, electricity) or used to pay for public services (education, defence, policing). The operators of the black economy enjoy these services without paying for them, without bearing the costs and worse: while others bear the costs. These encourages them, in theory to use these resources less efficiently.
And all this might be true in a highly efficient, almost ideal market economy. The emphasis is on the word "market". Unfortunately, we all live in societies which are regulated by bureaucracies which are controlled (in theory, rarely in practice) by politicians. These elites have a tendency to misuse and to abuse resources and to allocate them in an inefficient manner. Even economic theory admits that any dollar left in the hands of the private sector is much more efficiently used than the same dollar in the hands of the most honest and well meaning and well planning civil servant. Governments all over the world distort economic decisions and misallocate scarce economic resources.
Thus, if the goals are to encourage employment and economic growth - the black economy should be welcomed. This is precisely what it does and, by definition, it does so more efficiently than the government. The less tax dollars a government has - the less damage it does. This is an opinion shares by most economists in the world today. Lower tax rates are an admission of this fact and a legalization of parts of the black economy.
The black economy is especially important in times of economic hardships. Countries in transition are a private case of emerging economies which are a private case of developing countries which used to be called (in less politically correct times) "Third World Countries". They suffer from all manner of acute economic illnesses. They lost their export markets, they are technologically backward, their unemployment skyrockets, their plant and machinery are dilapidated, their infrastructure decrepit and dysfunctional, they are lethally illiquid, they become immoral societies (obligations not honoured, crime flourishes), their trade deficits and budget deficits balloon and they are conditioned to be dependent on handouts and dictates from various international financial institutions and donor countries.