Money can't buy you happiness

You're cycling¹ along and you spot a coin or note on the ground. Presumably whether you stop to pick it up depends on its value, so how much does it have to be before it's worth stopping, dismounting, picking up, remounting, and picking your speed back up?

[Poll #1396261]

¹ If you don't cycle, assume some other means of transport that's comparably inconvenient to interrupt.

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[Poll #1396328]