3. The cost benefit principles suggest that:

a. pursue all choices where benefits are equal to or smaller than costs

b. make sure to calculate how much it costs to consume one or more unit of your choice

c. You need to look at the full set of costs and benefits for any choice.

4. This question has multiple answer:

Which of the following is not a factor causing shift in supply curves?

a. income

b. input price

c. price of goods and services