Abstract
The size and growth of the so‐called “black economy” has provided a great deal of discussion in recent years. Typically the discussion has been confined to editorials and articles in leading newspapers, but of late politicians, civil servants and even academics, on both sides of the Atlantic have commented on the rise of the black economy. Despite this volume of comment, very few serious attempts have been made actually to measure the size of this unobserved sector for the UK.