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Hey ScoTTyBEEE
Ok you know have £165 from the sale of your original computer . . .
No this is flawed reasoning? . . . your new Intel® Core™ i5 upgrade cost you £350?. . . the £165 from your older parts is not monopoly money?
People don't sell their homes for £300,000 and buy a new home for £400,000 and say the new home cost them £100,000? . . . . people don't sell their car for £3,000 and buy a new car for £4,000 and say their new cars cost them £1,000
What you have done is forgotten (or made yourself forget) that your original machine had your money "invested" in it giving it "value" . . . If you had not bought any new computer parts you would now have £350 in your wallet . . . just enough to buy:
When they buy that £400,000 home though they did not need to raise £400,000 to buy it did they? Only the £100,000 difference + fees.
To say it was an option to sell the £300,000 house and have no house at all is silly.
Also their assets have increased.