Suppose you grow vegetables and want to sell your produce at a local farmers market. Even now that most trades happen electronically, it benefits everyone if the exchange sets certain hours as the business day, so that buyers and sellers know exactly when everyone else will be ready to buy and sell. In response to new technologies and increased demands, the stock market began offering extended hours that now allow you to trade shares as early as 4 a.m. and as late as 6:30 p.m. but there are fewer buyers and sellers at those times.
‘Why Does the Stock Market Have Pre-Market and After-Hours Trading?’ – New York Times
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