If you’re alone on an uninhabited island, you don’t need money; you only need resources and labor to process those resources for survival. In other words, there’s no need for an exchange-based economy. The exchange of goods led to the development of an economic system that dramatically increases efficiency and productivity. The monetary system was created because society consists of many people living together. To facilitate exchange, value had to be measured, and a price assigned to that value. The foundation of wealth is built on production and exchange. We all rely on others to survive. - Joseph’s “just my thoughts”
"Apples are the fruit" is a true proposition. At this time, "apples" are a Sufficient Condition to be fruit, and vice versa, because the "fruit to be an apple is more necessary for other conditions such as "red, round", the fruit is a Necessary Condition to become an apple. If the proposition of "If you respect someone, you'll get married" is "true," it's a "Sufficient Condition" to find someone you admire for marriage, but it's just only a "Necessary Condition" to find someone to marry for respect. Even with respect, you can not get married. You can't get married even if the Reverse Proposition is "true." Because marriage is a matter of "choice" before conditions or needs. If you want a respectable man, you can find a great man. To live comfortably, you can find a rich man. So, is there no Necessary-Sufficient Proposition for a marriage (conditions where both the proposition ...
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