Salt was the mineral that the afar men occasionally mined as a trade good.
Answer:
Option A is correct
Firms have different costs.
Explanation:
Option A is correct
Long run supply curve is upward sloping or constant horizontal line depends on the industry whether it is variable cost industry (increasing production cost) or a constant cost industry respectively. Option A is correct because if firms have different production cost and it is increasing as the output is increasing then it is upward Sloping long-run supply curve.
Alice is willing to spend $30 on a pair of jeans, and has a coupon for $10 off she found online. She selects and purchases a $35 pair of jeans, pre-discount.
(Alice's consumer surplus, $5)
<span>Jeff finds some steaks for $16 for which he would have been willing to pay $20. The butcher notices the meat is near the expiration date and gives him an extra 75% off. </span>
(Jeff's consumer surplus, $16)
<span>Nicole has in her possession a hockey puck from the 2010 Winter Olympic Games and sells it on eBay. She will only sell the puck if the winning bid is greater than or equal to $500. After bidding closes, the last bid stands at $500. </span>
(Nicole's producer surplus, $0)
<span>Claire is trying to sell her used calculus textbook online. She asks for $150 or best offer and is willing to sell for anything over $100. She is able to sell it for $125. </span>
(Claire's producer surplus, $25)
<span>Roy is willing to pay $2.50 for a sports drink. He notices the price is $2.79 and chooses not to purchase a sports drink. (Roy's consumer surplus, $0)</span>
