Two weeks ago, investing icon Jeremy Grantham turned apocalyptic and warned that the "Bursting Of This "Great, Epic Bubble" Will Be "Most Important Investing Event Of Your Lives." Since then the market has generally continued to melt up, yet Grantham's conviction that all this will end in tears has only grown, and in an interview with Bloomberg today, the co-founder of GMO who correctly called the last two crashes, now predicts that Joe Biden’s economic-recovery plan will propel stocks to perilous new heights, followed by an inevitable crash.

“We will have a few weeks of extra money and a few weeks of putting your last, desperate chips into the game, and then an even more spectacular bust,” the value-investing legend said in a Bloomberg “Front Row” interview.

“When you have reached this level of obvious super-enthusiasm, the bubble has always, without exception, broken in the next few months, not a few years.”

Amid market euphoria the likes of which have - literally - never been seen before as the following chart from Citi shows.

This prompted Citi, BofA and Goldman to all warn that a selloff appears imminent, and which was fueled by risk-taking behavior funded by the latest round of pandemic-relief checks, Grantham has “no doubt” at least some of the $1.9 trillion in federal aid Biden is seeking from Congress will end up being spent on stocks instead of food or shelter.

While that will help push stocks even higher, Grantham then sees it all ending in tears, or rather a collapse rivaling the 1929 crash or the dot-com bust of 2000, when the Nasdaq cratered 80% before recovering thanks to trillions more in Fed "stimmy" checks.

And while some (increasingly fewer) investors claim that today’s valuations are justified by the growth potential of transformative technologies and new business models, Grantham, 82, dismisses that argument as fanciful, and rejects the popular theory that the Federal Reserve can cushion or even the next crash with even more QE or easing.

“At the lowest rates in history, you don’t have a lot in the bank to throw on the table, do you?” he said.

Unfortunately for Grantham, and his now cemented reputation as a perma-bear who misses out on rallies, the stock market has sneered at all warnings it will crash and just keeps on rising.

To be sure, as we reported last year, GMO’s bearish stance has been costly as assets under management fell by tens of billions of dollars during the decade-long bull market, as the firm steered clear of growth stocks. Then in April, GMO doubled down, insulating its portfolios from directional bets on the market and largely missing out on the second leg of the 2020 rebound.

As Bloomberg notes, Grantham thought the economy was on shaky ground even before the pandemic and he was concerned about the steady decline in U.S. productivity, warning that the Fed had only succeeded in blowing out the inequality and income gap to a record wide, amid worries that the profit-at-all-costs nature of American capitalism was destroying the environment and fraying the social fabric.

For Grantham, the combination of fiscal stimulus and emergency Fed programs led to “spectacular excesses” and pushed an already overvalued market into bubble territory.

Echoing BofA's earlier note, Grantham believes that the Fed's "Immoral hazard" will have other devastating consequences as well:

“If you think you live in a world where output doesn’t matter and you can just create paper, sooner or later you’re going to do the impossible, and that is bring back inflation,” Grantham said. “Interest rates are paper. Credit is paper. Real life is factories and workers and output, and we are not looking at increased output.”

As a reminder, earlier today, BofA's CIO Michael Hartnett - who is similarly concerned about the near-future - warned that asset price (hyper)inflation will eventually drag Main Street inflation higher, risking a disorderly rise in bond yields, which results in a taper tantrum, tighter financial conditions and "volatility events", i.e., a market crash.

Grantham agrees and warns that the threat of inflation is the biggest risk, which is why he also thinks that bonds are risky. He also has reservations about gold because it generates no income. And in his view Bitcoin is make-believe nonsense.

In short, he is an asset manager who sees no attractive assets, and who is prohibited from shorting because the Fed will just keep ramping prices ever higher.

While selling everything and holding cash is one option, Grantham said his best advice for long-term investors is to focus on low-growth stocks that are cheap relative to benchmark indexes, emerging markets and companies fighting climate change with renewable energy and electric-car technology.

“You will not make a handsome 10- or 20-year return from U.S. growth stocks,” he said. “If you could do emerging, low-growth and green, you might get the jackpot.”

All this and much more in his full 38 minute interview with Bloomberg's Erik Schatzker below: