Inside there are quite a few activities to help kids learn some basics about money. There is a discussion about wants versus needs and a little chart to fill out to get kids thinking about what is truly necessary. There is also a page devoted to making choices and opportunity cost.
And here we have a page about earning money where kids are encouraged to brainstorm some ways they could earn some.
I think spending some time with this little book and the website will be a nice follow-up to Whatever Happened to Penny Candy? which Grace and Christopher just read for Core F.