One of the keys to these is looking at the prompt, which points out that you can use:
Ways to weaken the argument
Ways to strengthen the argument
Typically those go hand-in-hand, so if you don't find any "assumptions" per se, just ask yourself if you can come up with hypotheticals that would weaken the argument. Here are a few that come to mind for me:
-could a greater interest in gourmet food mean that people are more likely to want to cook it for themselves as opposed to going out for it?
-could the number of single-person households actually mean that fewer people are going out to eat? Maybe families/couples eat out more than singles?
-Are rising personal incomes sustainable?
-Does "more leisure time" really correspond to more eating at restaurants? Couldn't that lead to more travel outside of Spiessa, or more people pursuing their own cooking/vegetable-gardening?
I find that a lot of times it's easier to propose weaknesses ("well, what if...?") and then retrofit the assumption. For example, that last point "people could want to cook or grow their own food more with more free time" points out the assumption that "more free time ---> more restaurant patronage"
I hope that helps...
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