1) Explain why positive externalities are considered a market failure. To explain it, use the concepts of Marginal Benefit, Marginal External Benefit and Marginal Social Benefit.

2) Which of the following involves the production of a commodity? which is correct

1. A woman that reared children that become labourers and grant money to their mother.
2. A woman that advertises "womb for rent".
3. A woman that provides caregiver services and is paid with free housing.
4. A hunter in Northern Canada that exchanges wild meat by berries

3) How different economic systems can be distinguished from each other? which is correct

1. Through how to profit/surplus is shared among the production process participants.
2. Through how decisions are made regarding for whom, how and what to produce.
3. Through the nature of government rules.
4. Through the kind of production factors involved in the production process