The current UK government is full of people who believe rich people keeping their money is how you stimulate the economy in to growth. It's not a completely unreasonable position according to economic theory but there are plenty of reasons to disagree with it.

If your economy cannot produce all the products consumers consume then you need to encourage saving.

If the economy cannot consume all the products the suppliers produce you need to encourage consumption.

If you perfectly hit the balance (unlikely but in theory possible) then you need to do... nothing, neither savings nor consumption increases.

It depends on what your economy needs.