Juanita can minimize her total cost by shopping from the Neighboring city market.
It is given that when Juanita buys from a local store spends 15 minutes going to the market, 30 minutes shopping, and 15 minutes coming back home. Thus, the total time spent in the local market is 60 minutes. Thus, the opportunity cost of time is the wage rate per hour, which is $16.
Similarly, in across-town shopping, she spends 30 minutes to reach the market, 30 minutes to shop, and again 30 minutes to return. Therefore, the opportunity cost of time is $24 ($16 + $8).
Besides this, the opportunity cost of time by shopping in a neighboring city is $40 ($16+$16+$8).
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