In real life the situation is more complex than in our simple analogy.

But for the beginning it is useful to demonstrate these differences with a simple analogy.

That's like saving £5 now at the cost of having to pay £10 in a years time (to use a simple analogy).

This argument, however, is clearly untenable as a simple analogy will illustrate.

The other simple analogy is to the chain reaction of nuclear physics.

But he did have a simple analogy in it to explain the concept.

However, I think a simple analogy might help.

A simple analogy is that of friction on a surface.

But it's the best simple analogy I can use to describe it.

One of the simplest analogies that does not really work is simply the circle.