According to Gordon Tullock monopoly: a. profits or rents are subject to rent seeking the welfare cost triangle
b. is subject to rent seeking X-inefficiency
c. is something that differentiates government monopolies from private monopolies
d. the theory of monopoly is superior to the theory of perfect competition

a. profits or rents are subject to rent seeking the welfare cost triangle

Explanation:

Monopolies are businesses that have sole control of the supply and pricing of a product. Dead weight loss used to be regarded as consumer surplus that does not affect the amount of product that a monopolist can provide.

Gordon Tullock however argued that loss also occurs when businesses are seeking to be a monopoly. There is an associated cost on obtaining and maintaining a monopoly called rent seeking.

Also an additional cost as result of dead weight loss due to payment of tarrif. This can result from net welfare benefit or loss as a result of government policy change (this is referred to as welfare triangle).

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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.