In America, workers are allowed to keep more of the income from an extra hour's work.

ECONOMIST: Why don't rising incomes make everybody happier?

Taxes reduce the incentive to work an extra hour rather than go home, or to put in extra effort in the hope of promotion.

ECONOMIST: Why don't rising incomes make everybody happier?

It began in December 1967 when five secretaries at a ventilation and heating company volunteered to work an extra half hour each day without pay to do their bit for the flagging economy.

BBC: Buy British: Why isn't there a new campaign?