Why have bananas become the new avocado?

I always seem to have to buy bananas in advance and wait a few days for them to ripen these days, in the same way I always used to have to with avocados. It's really annoying that I can no longer treat them as a last minute snack idea when I shop.

Why have bananas become the new avocado?
Why have bananas become the new avocado?
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