New York Times - After years of emulating the flashy United States stock markets, countries around the globe are now using America as a model for what they don’t want to look like.

Industry leaders and regulators in several countries including Canada, Australia and Germany have adopted or proposed limits on high-speed trading and other technological developments that have come to define United States markets.

The flurry of international activity is particularly striking because regulators have been slow to act in the United States, where trad...


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