What killed his plant was the effect of higher labour costs on suppliers, who one by one moved to Asia.

ECONOMIST: Jobs come, but they soon go again

That is because a cluster will create pools of skilled labour, internationally competitive suppliers, access to venture capital and a sympathetic regulatory environment.

ECONOMIST: Fashions are changing in the inward-investment business

It uncovered 106 cases of underage labour being used at Apple suppliers last year and 70 cases historically.

FORBES: Apple Investigation: 0.01% Of Their Workforce Was Under Age

Under the terms of its code of practice for suppliers, Primark prohibits the use of child labour in its manufacturing chain.

BBC: Primark fires child worker firms