Jack agrees to sell tyler his pocketknife for 3 baseball cards. tyler sells his soccer ball for 2 baseball cards. in what way are baseball cards used in this example?
in this example, baseball cards are used as ( it doesn't give me answer choices but im stuck. econ and personal finance is not my thing).

Being an expert problem solver is something you're either born with or not. true or false

Jack manufacturing company had beginning work in process inventory of $8,000. during the period, jack transferred $34,000 of raw materials to work in process. labor costs amounted to $41,000 and overhead amounted to $36,000. if the ending balance in work in process inventory was $12,000, what was the amount transferred to finished goods inventory?

White truffles are a very prized and rare edible fungus that grow naturally in the countryside near alba, italy. suppose that it costs $200 per day to search for white truffles. on an average day, the total number of white truffles (t) found in alba is t = 20x − x 2 , where x is the number of people searching for white truffles on that day. white truffles can be sold for $100 each. if there is no regulation, how many more people will be searching for white truffles than the socially optimal number?