In a previous blog we discussed the factors that have pushed issues of corruption to the centre of policy debates about sound economic management. A related question deals with the sources of corruption: where does it come from, what are the factors that have nourished it and turned it into such a powerful impediment to sustainable economic development? Economists seem to agree that an important source of corruption stems from the distributional attributes of the state. For better or for worse, the role of the state in the economy has expanded in a major way over the past century. In 1913 the 13 largest economies in the world, accounting for the bulk of global economic output, had an average expenditure ratio in relation to GDP of around 12%. This ratio had risen to 43% by 1990, with many countries’ ratios well in excess of 50%. This rise was associated with the proliferation of benefits under state control and also in the various ways in which the state imposes costs on society. While a larger state need not necessarily be associated with higher levels of corruption—the Nordic countries illustrate this—it is the case that the larger the number of interactions between officials and private citizens, the larger the number of opportunities in which the latter may wish to illegally pay for benefits to which they are not entitled, or avoid responsibilities or costs for which they bear an obligation.