Phrases with «to be the sweet spot»

Do you think there is a sweet spot for how many colors to include in something like this? (corporette.com)
Mostly wondering if there was a sweet spot for the amount of rent you can charge in this area. (biggerpockets.com)
If there's a sweet spot in terms of pricing for gaming laptops, it's definitely around $ 1,500. (thatvideogameblog.com)
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