The day London's trading floor went quiet — and the screens took over.

On October 27, 1986, the London Stock Exchange underwent the 'Big Bang,' a sweeping deregulation. Fixed commissions were abolished, foreign firms were allowed to buy into British brokers, and trading moved from face-to-face dealing on the exchange floor to computer screens.

The changes helped turn London into one of the world's leading financial centers, though critics later linked the new culture to excessive risk-taking.

It marked a shift in how money moves around the world.

Did the Big Bang do more good or harm?

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