Advantages the united states brought to the allied cause included everything listed except:
a. a boost in morale
b. supplies and equipment
c. the russian surrender
d. the strength to drive the germans back

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.