Which of the following factors played the biggest role in the slow growth of average incomes in the united states during the 1970s and 1980s?
a. increased competition from india
b. increased competition from japan
c. slow growth in productivity
d. disinflation of the dollar

C. Slow growth in productivity

Explanation:

Within the period of 1970s and 1980s , the countries in western hemisphere experienced an energy crises, which caused by the reduction of oil supply from the middle east nations.

Because of this, many industries that directly use this resources (such as automobiles and  pipelines for example) experience many problems in maintaining high level of productivity.

Since these sectors employ large number of American citizens, this lead to the the slow growth of average incomes in the United States during the 1970s and 1980s

answer makes less frequent trips to the bank and firms make less frequent price changes;

of the three mortgage options that demarco and tanya have to choose from, the balloon payment mortgage would be their best option, over adjustable payment and fixed payment plans.ultimately, the balloon payment plan would save demarco and tanya overall, in interest, would cost less monthly, and they would only have to make these payments for 8 years, opposing to 30 years for adjustable or fixed payment plans. 

overall, demarco and tanya would save $80,811 if they chose balloon payments over fixed payments, and would save $116,711 if they choose balloon payments over adjustable payments. benefits with choosing fixed payments over adjustable payments is that, in the end, the payments will still be $836.30 a month, while with adjustable payments, the initial monthly payments will be $763.38 to $1082.70 a month, ultimately leading to a more costly purchase. benefits with choosing fixed payments over balloon payments are not present. benefits in choosing adjustable payments over is that it has a lower interest rate, and starts with lower monthly payments initially. benefits in choosing adjustable payments over balloon payments include a lower interest rate, and lower initial monthly payments. benefits in choosing balloon payments over fixed payments include lower interest rates, lower overall price, lower monthly payments, takes less time to pay off, and does not require a downpayment. benefits in choosing balloon payments over adjustable payments include, lower monthly payments (when averaged), takes less time to pay off, and lower overall price.

hence, option c, balloon payments, is the best option for demarco and tanya to make this purchase, for it will save them a minimum of $80811, and a maximum of $116,711.