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csec pob csec economics csec principles of business hire purchase layaway production department human resources department scarcity economic goods free goods choice floating exchange rate fixed exchange rate exchange rate regimes managed float exchange rate systems broad money narrow money m1 termination of contracts export level of production surplus production trademarks copy marketing branding packaging division of labour resources role of government indirect taxes direct taxes csec principles of business section 4 discharge by impossibility discharge by performance market economy mixed economy traditional economy planned economy economic systems labour supply regulation wages labour mobility voluntary agreements marginal social benefit marginal external benefit marginal private benefit marginal social cost marginal external cost marginal private cost functional distribution of income size distribution of income classes distribution of income marginal costs average costs terms of sale