There doesn't appear to be any clear evidence which way valuations will go in the next 10 years or so.
The governments have been borrowing and printed more money like crazy, so one school of thought is this will lead to a high level of artificial inflation (printed money will be worth less). This will artificially raise the price of things like gold and watches, but you might not get more "buying power" for them.
The other completely-opposite thought is we are on the verge of an economic collapse and we'll all be in soup lines soon. If that is the case, then "cash is king" and things like watches will go way down in price.
No telling what the future holds, so, like always, live life to the fullest and enjoy things like watches along the way.
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