For each of the following scenarios, determine which market model best describes the scenario. Then identify the number of firms, the type of product, and the ease with which new firms can enter the market under this market structure.
Scenario Number of Firms Type of Product Entry Market Model a. Hundreds of colleges serve millions of students each year. The colleges vary by location, size, cost, and educational quality, which enables students to match schools to their diverse preferences.
b. Hundreds of high school students who require tutoring in algebra choose among dozens of tutoring companies offering similar services.
c. Three airlines operate between San Francisco and San Diego. There are not enough potential customers to share the route with a fourth airline without causing the average costs of the existing competitors to rise substantially.
d. Consumers view all airlines as the same service and will select the least expensive one. The government has granted the U. S. Postal Service the exclusive right to deliver mail.

answer; enforce the rules;

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. 

do u have any choices