Of course an animated gif would illustrate this better. I have been told that sheet bends are famous particular for linking two ropes of different sizes together.

Tie a sheet bend

We have a tendency to think that we’ll be able to act differently in the future. So while this lucky chap plans to start his diet tomorrow having been presented with this giant cake, he underestimates his likelihood of not sticking to it on future days.

Present bias

We’re not very consistent at estimating the future value of something and have a bias, perhaps motivated by survival, towards overvaluing nearer outcomes at the expense of later ones.

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Hyperbolic discounting