Answer:
a. Import more bushels of wheat from Mexico
Explanation:
When the real exchange rate is higher than one, a country is likely to import more, since goods are cheaper in the other country than locally. In this example, a bushel of wheat, in the US, costs $6.40, while in Mexico, the same product costs:

Therefore, the US will Import more bushels of wheat from Mexico.
Answer:
A general rule of thumb among marketing researchers is to use secondary data first and then collect primary data.
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Answer:
D. reduce economic efficiency; deadweight loss
Explanation:
Market failures are produced when in a free market context, individual decisions for the allocance of resources is inefficient, and produces deadweight loss, an economic measure of social welfare. This situation justifies in some cases government interventions. The most common tools for intervention are taxes, subsidies or price regulation.