cost-benefit

i go to my parents' place and see this 9-inch-high cardboard blocking the bottom part of their door.

me:  'why do you have that?'

mom:  'so the cat won't get in...'

me:  'what if you trip?'

mom:  'it's for the cat...'

me:  'but it's a door!  what is your risk?  that you will trip and break a bone.  what is your yield?  that the cat won't get in.  is it worth it?'

it's basic:  high risk, high yield.

you prevent a cat from coming in.  i don't think that's worth a tumble.

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