If investors ever needed a clear signal that this is the top of the market, they now have one.
Walgreens Boots Alliance shares surged on November 6 after speculation that the US-listed drugstore group has been considering a $70bn take-private deal.
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A $70bn Walgreens buyout would signal the top of the market
The deal would be the biggest LBO ever and has echoes of another troubled deal from the past
