Refer to the diagram. Points A, B, C, D, and E show:

In the diagram, the range of diminishing marginal returns is:

The elasticity of supply of product X is unitary if the price of X rises by:

The supply of product X is perfectly inelastic if the price of X rises by:

Competition means that:

Unlike a private good, a public good:

Suppose the supply of product X is perfectly inelastic. If there is an increase in the demand for this product, equilibrium price:

A product has utility if it:

The production possibilities curve has:

Which of the following gases is expected to have the greatest b value in the van der Waals equation?