Mr Mydat said his claims about some schools not wanting ethnic minority supply teachers are against a background in which most schools have become much more professional about hiring supply teachers.

BBC: Supply teachers face racism from schools, says agency

Foreign countries already supply about a quarter of professional players in the U.S., most of whom come from Latin America.

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To take another industry I am well acquainted with, the transformation of the media ecosystem, the supply and demand dynamics of professional writers have completely changed, leaving some writers poorer (and some richer).

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Tom Hadley, policy director for the Recruitment and Employment Confederation, the professional body for the UK recruitment industry, denied supply teachers were being exploited.

BBC: Wales

Sports equipment makers could boost margins by combining relationships with retailers and professional and amateur sports teams, and by merging supply chain management and sales and marketing forces.

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After building a financial services company in the United States and leading an agribusiness social enterprise in Kenya, Madison combined the insights from his professional experiences to start Farm Shop, an organization that aims to increase the incomes of the entire supply chain of smallholder producers in Kenya by creating retail agri-inputs franchises.

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