How to control a wife's spending

How do other's handle a wife who spends without regard? Mine has good job and all, but I write the checks......so I see the bills, but she does not even think about it. every month it's like $$$ here to the Amex, $$$ for this, $$$ for that....stuff that is BS...... or may not be BS, but something you would not have bought if you could not afford it. because most things can be rationalized given enough thought. How do you get them to understand...."hey just because you may have the money now, does mean the money would not be better spent paying off the mortgage or stashed away" what do others do?

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