My wife is an impulsive buyer and spends a lot of money without thinking twice. Am afraid we are not saving enough. How do I explain her?

My husband throw a temper once and point put to the pile of things i buy and ask did i use? And show us the bank account balance, how he is going to spend and eat at work, etc. Of course need a 3rd party to go through and remind her too. So now, i will think thrice before buying.