The existence of a “shadow economy” which is defined here as economic activity which is unrecorded in official statistics and hence not subject to normal taxation and regulation, is a phenomenon which has been much studied in both western industrial countries and in post- Soviet era...

GDP accounts are customarily compiled in several alternative ways, each aggregating transactions in different ways, but all (at least in theory) adding to the same total. Two of the most common aggregations are that focused on expenditures (based on the standard national income accounting...