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The labour market
AmosWeb Encyclonomic Web·pedia offers a fairly gentle overview of resource markets (once logged in, either select R from the top of the page, and then click on the resource markets link, or search for "resource markets").
Robert E Schenk's Cyber Economics site offers a detailed set of resources on Problems in Resource Markets, including a good explanation of Marginal Productivity and a useful exposition of Tournament theory (you'll need to work your way through several different pages).