FTSE 100 Gains Under Thatcher Unmatched as Britons Vote: Chart

With Britons heading to the polls Thursday, incumbent and favorite Theresa May faces a high bar for delivering stock returns set by another Conservative prime minister -- Margaret Thatcher. The FTSE 100 Index more than doubled from its inception seven months into the Iron Lady’s second term until her departure in 1990, as she led the “Big Bang” deregulation of financial markets. The gauge of megacaps has fared best during Tory rule in the past three decades, rising about 13 percent under May, whose lead against Labour rival Jeremy Corbyn has narrowed in recent polls.

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