A shortage exists at a point in time, propensity to pay to make the asset may react to the demand for the asset, but there is no guarantee that supply of labor and capital meet at an efficient point. (art is a great example where the overlap between supply and demand may have no overlap at all for certain pieces).

Lack of demand for labor and skill can produce an asset shortage, but in an economy where supply and demand float, the theory is that shortages reflect supply-demand failures, and the degree to which supply of labor is invoked to solve shortages for goods depends on the elasticity of demand and the elasticity of supply.