Introduction:
Marginal opportunity cost (MOC) is the cost of producing one extra unit of a good or service in terms of the next best alternative forgone. It is the difference in cost between producing one additional unit of a good and producing one less unit of another good.

Reasons for Increasing MOC:
There are several reasons why MOC may increase, including:

1. Resource Scarcity: As resources become scarcer, the MOC of producing additional units of a good will increase. This is because resources must be diverted from other uses, which will have a higher opportunity cost.

2. Diminishing Marginal Returns: As more units of a good are produced, the marginal cost of production tends to increase due to diminishing marginal returns. This means that each additional unit of a good will require more resources than the previous unit, which increases the MOC.

3. Technological Constraints: Technological constraints can also increase the MOC of producing additional units of a good. For example, if a company has reached the limits of its current production technology, it may need to invest in new technology to increase production, which will increase the MOC.

4. Market Demand: Market demand can also increase the MOC of producing additional units of a good. If demand for a good increases, producers may need to invest in additional resources or technology to meet that demand, which will increase the MOC.

Conclusion:
MOC is an important concept in economics, as it helps to determine the cost of producing additional units of a good. Understanding the factors that can increase MOC is essential for businesses and policymakers who want to make informed decisions about resource allocation and production.