Слово "investment". Англо-русский словарь Мюллера

“It is, of course, well known to you that in a successful banking business as much depends upon our being able to find remunerative investments for our funds as upon our increasing our connection and the number of our depositors. One of our most lucrative means of laying out money is in the shape of loans, where the security is unimpeachable. We have done a good deal in this direction during the last few years, and there are many noble families to whom we have advanced large sums upon the security of their pictures, libraries, or plate.

It's difficult to say exactly; investments fluctuate all the time.

Harry had then asked if he could simply tell Griphook how to diversify his investments beyond stacks of gold coins sitting in his vault.

Think of our investment.