This is The Takeaway from today's Morning Brief, which you can sign up to receive in your inbox every morning along with: What we're watching What we're reading Economic data releases and earnings The model of a bubble implies a crash. Just as metaphors of frothiness indicate unsustainable price increases. Sure, portfolios are growing, that's easy to see for those locked into the daily gyrations of the market or brave enough to take a look at their retirement funds. But what about all the concerned lo ...