Synonyms for the word externality could be: face, area, level, side, skin, top, etc.
Answer:
I would say It would be more expensive.
Explanation:
Not really sure how to put this in a complete sentence
The answer is definitely A. Houses. Basing on the Demographic Transition Model (DTM), countries categorized under stage 4 are said to have a stabilized population growth in other words birth and death rates are merely low. But still gradually on increasing number. As total population increases, housing now becomes insufficient. Examples of Stage 4 countries: Brazil, China, Argentina, Singapore, U.S.