Maintaining a safe and sound banking system, given the key role that banks play in most financial systems, contributes to the health of a country's overall economy. Most countries do this by some form of banking supervision, generally accepting that the added protection to the banking system in the form of supervision is worth the costs of the regulatory burden.
This last estimate is required this year, for example, in order to answer the question of what role is played by the deceleration of inflation, relative to the rate assumed in the budget, in explaining the underperformance of tax receipts. This factor, rather than slower growth, may explain most of the shortfall.