Not buying the phone = no sunk or fixed cost. You won't be locked into an expensive contract if you just use the old one.
Percentages matter because people think "OMG I'm saving $10! What a steal! I have to get the cool phone" instead of "F%ck I ain't spending $2000 on a phone that's marginally improved."
It's called long term financial planning.
Not buying the phone is not the option we were discussing. We were talking about people who want an iPhone 5S and whether the $10 discount at Walmart matters. If the default position is—just like any microeconomics problem—"I will begin this venture," then the contract and some baseline cost for the device are fixed or sunk costs.
Percentages don't matter because at the end of the day, the only thing that matters for a person who has decided to purchase an iPhone 5S is the marginal cost. The notion that they shouldn't care about $10 just because the contract and phone itself are pricey is absolute and unadulterated idiocy. That's as stupid as saying that you shouldn't care whether you use a $10 shopping coupon because your mortgage is expensive. Again, for about the third time, $10 is $10. If a person has some moral objection to shopping at Walmart, or doing so is somehow more inconvenient, or Walmart doesn't have sufficient stock, then sure, there's an argument for not doing it. But ceteris paribus, I see no reason why an economically rational buyer wouldn't choose to save themselves $10. It's just as significant there as is a shopping, dining, or other type of coupon.
Also, your example is irrationally constructed (as is the rest of your gibberish, so I'm not sure why I'm surprised) because it presents a false dichotomy. If they're using the same carrier, then it's not a $2000 marginal expense. The person using their "old one," to quote you, still incurs the contract cost. Thus, the only marginal expense is the cost of the phone. And again, the case I was discussing was the person who has already decided that they want to get an iPhone 5S—although it really doesn't matter, because the person on the fence has three choices:
1) Not upgrade and pay the contract fees monthly
2) Upgrade at $199+tax+upgrade fee at a usual suspect retailer
3) Upgrade at $189+tax+upgrade fee at WalMart
It's called understanding basic microeconomics. I'm not sure why this is so difficult for you to comprehend, but I sure wouldn't want you managing my finances with your cavalier attitude. That approach is what got so many people in trouble, justifying each incremental expense with the non-sensical logic, "Oh, it's just a little bit more; I'll add it to my revolving credit card bill."
You'd be well served to obtain and read a book on microeconomic decision making.
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