The diagram illustrates the labour supply curve for two distinct markets, X and Y. What accounts for the variation in the slopes of the labour supply curves?
- AMarket X has a higher marginal revenue product per worker than Y.
- BMarket X has a higher percentage of its labour belonging to a trade union than Y.
- CMarket X has higher labour costs as a percentage of total costs than X.
- DMarket X has more specific skills and training requirements than Y.