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In financial markets the term kerb is used to describe trading outside official market hours. The expression comes from trading literally taking place on the kerb outside the stock exchange.
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kerb market UK US noun [C] UK (US curb market)
► STOCK MARKET the trading of shares outside the system of official stock markets or at hours when those stock markets are closed: »
The reluctance of banks to lend to private companies forced the city's entrepreneurs to turn to the kerb market.
Financial and business terms. 2012.