She's putting her money where her mouth is...she doesn't need to prove anything. OP is calling her out -- but he's not saying why he thinks stocks are in a bubble. Is he short? No clue.That's not a straw man argument. If she said that, she means it, and is betting against sky-high historical market valuations. The burden of proof is on her to explain why those famous last words ("this time it's different") are true.