This increase and expansion has been fostered particularly by the increasing international sub-division of work, the resultant extension of foreign trade relationships, the increase in the purchasing power of the inland markets during the post-war boom period, increasing industrialisation, and the mass production of industrial and agricultural products.
Olu lwando nokukhula kukhuthazwe kakhulu kukukhula kokwahlukana komsebebzi wamazwe, oziphumo zandise kumanye amazwe obudlelwane borhwebo, ukukhula kwamandla entengo yangaphakathi emarikeni ngexesha lokuhamba ngokukhawuleza lemfazwe yokuphumelela kwamashishini intlanganiso yamashishini nemveliso yezolimo.