Question 21 Why would the division of labor without trade not work? There would be no comparative advantage, the division of labor does not work without trade. It works when workers buy goods and services from their income which they receive for doing their jobs. Also, without trade, we can't specialize. For example, if I want grocery I don't just grab it at the shops I will pay for it, (that's trade) then get it. If we one is unable to trade, one would have to produce everything oh his/her own which is impossible. So, we need a trade for the division of labor to work. Question 22 Can you think of an example of free goods, that is, good or services that are not scarce? Free goods are described as products which are available in abundance and, therefore, consumers don't need to pay anything to use them. It is the goods that are not scarce, with zero opportunity costs. The free goods include air, water, government healthcare services, sunlight, web page, road, road lights...just to mention. (Vinish P, 2012) Air is something we need, and we can simply breathe in it, there is still enough air for everyone to breathe. The web page is also available at no opportunity cost and sunlight is also available for anyone. Water is a free good most especially to those who live next to the rivers unless to those who live in desserts environment. ( Tejvan P, 2017) Word count: 290 Reference Tejvan, P (2017, May 3 ) Definition of a free good. Retrieved on June 25, 2018, from https://www.economicshelp.org/blog/2844/economics/definition-of-a-free-good/ Vinish, P (2012, December 10) Free good examples. Retrieved on June 25, 2018, from https://www.letslearnfinance.com/free-good-examples.html