London regained a global presence thanks to the relaxation of exchange controls in 1958, the development of the Eurocurrency and Eurobond markets in the 1950s, and the deregulation of capital and securities markets in the 1980s. In the 1990s London’s most significant revenue-earning function was to provide a center for the international banking market. A unique concentration of banks from every corner of the globe allowed an exceptional range of currencies to be traded. In the competitive climate of contemporary global finance, it captured a large share of activity in the newer, esoteric markets—swaps, cross-exchange equity trading, and currency options—and also maintained its historical position in the conventional fields of international bank lending, underwriting, bond trading, foreign exchange trading, and investment management. London became Europe’s main center for large volume trading in securities. It dominated the world market in marine and aviation reinsurance.