Boom, then Bust? February 20, 2021, 8:22 AM·36 min read Well, the S&P may not have done much this week, but there were clear signs and signals that the conditions fueling the current bubble(s) are going to continue — and that the bubble(s) themselves are still bubbling away. Elon Musk, in some ways the man of the bubble (I do hope that comment doesn’t disqualify me from some space tourism), got to the point. Billionaire Elon Musk defended Tesla Inc.’s $1.5 billion Bitcoin investment on Twitter, calling the cryptocurrency a “less dumb” version of cash. “When fiat currency has negative real interest, only a fool wouldn’t look elsewhere,” Musk said in a reference to the sub-zero returns on cash caused by negative-yielding debt. The comments pushed Bitcoin to a record on Friday, with prices climbing above $53,000.