Legendary investor Jeremy Grantham warns the S&P is likely to crash by 30% - and could nosedive 50% if the 'wheels fall off'

• The S&P 500 will likely plunge by 30%, and could be cut in half, Jeremy Grantham says.
• The bubble expert predicts a recession next year and expects house prices to slump.
• Grantham also dismissed bitcoin as an "elaborate scam."

The S&P 500 is likely to crash by 30%, and could nosedive by over 50%, Jeremy Grantham has warned. He also predicted that US house prices will slump and a recession will strike next year, and dismissed bitcoin as a con.