A social good is an act that benefits the largest number of people in the largest possible way, such as clean air and water, healthcare, and literacy.

Individuals can become "free riders" by taking the benefits the common good provides while refusing to do their part to support the common good. An adequate water supply, for example, is a common good ...

For example, if a consumer is willing to buy an extra slice of pizza for $1, but rejects a price of $2, it can be deduced that the marginal benefit of an extra slice is somewhere between $1 and $2.

Less well-known is that good posture is also essential for optimal circulation, respiration, digestion and bladder function. Increasing evidence suggests it also improves cognitive ability and ...