"Giving". We all had to work for our pocket money. Instilling a work ethic is one thing, whereas, learning the value of money is something else.
Yes, I can see how requiring work for pocket money might be a good way to go.
But, actually we took the view that 'chores' were just part of household life, not paid labour. Nobody paid mummy and daddy to do the laundry and so nobody paid the kids to do it either.
We did have a system of random financial rewards, however. "You boys have been so helpful today, here is some extra pocket money." This works using the 'random reinforcement' principles discovered by Pavlov, Skinner et al. And the notion that 'prizes' are more motivational than 'wages'. An awareness of the '
over-justification effect' is also useful in these situations.
Also, as I said, my experiments mostly showed me that our boys did not 'learn the value of money' at all; I think their views on money were demonstrably innate and unchanging.