"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 and counterfactual are true)? It may be possible if there is anyone who can accept a hard life with him or her for the rest of our lives.
- Joseph's "just my thoughts"
"Discount" is the sacrifice of the value-added you have created. Failure to produce Value Added will result in no profit, and there is a greater chance that the net worth will decrease as much as the profit that has been reduced. The problem is the customer. "Discounting from the start" and "selling at a discount" are strictly different for customers. Neither can do it right if the sellers don't know the "cost". Surprisingly, many businessmen do business without knowing the value they add and the cost. - Joseph's "just my thoughts"
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