The figures are invented. In one day Country A can produce 40 units of textiles or 20 units of electronics, and Country B can produce 30 units of textiles or 10 units of electronics. Using a diagram of linear production possibilities curves, explain how specialisation and trade can benefit both countries.

HL Paper 1 part (a) style, 10 marks (HL-only content; standalone practice; not an IB question).