The "Triple Point" of a Substance Is That Point for Which

question 86

Multiple Choice

The "triple point" of a substance is that point for which the temperature and pressure are such that:

• A)only solid and liquid are in equilibrium
• B)only liquid and vapor are in equilibrium
• C)only solid and vapor are in equilibrium
• D)solid, liquid and vapor are all in equilibrium
• E)the temperature, pressure and density are all numerically equal

---

Definitions:

Marginal Social Cost

The cost to society of producing an additional unit of a good or service, including both private costs and any externalities.

Marginal Social Benefit

The additional gain to society as a whole from an additional unit of a good or service.

Emissions Tax

A tax imposed on the emission of pollutants, aimed at reducing the environmental externality costs of these emissions.

Optimal Tax

A tax designed to generate government revenue with the minimum economic distortion or welfare loss.