Ever agonized over buying a $40 sweater? A new, trending spending rule claims to be the key to helping you determine whether or not you should make that purchase. According to the 0.01% rule, if a purchase costs less than 0.01% of your total net worth, it’s considered a minor expense and can be made guilt-free. Based on this guideline, a person with a $500,000 net worth would be able to make any purchase under $50 without having to think twice. Read Next: 6 Things You Must Do When Your Savings Reach $50,00 ...