Healthcare and consumer staples are showing relative strength in "futures in stock" trading, signaling a defensive undercurrent despite overall market optimism. Thus, Bitcoin's early October rally has crypto market participants already talking up the potential of yet another "Uptober." The problem, of course, is that past performance is no guarantee of future performance. There's no rational reason to explain why Bitcoin does so well in the final quarter of the year, and that's what makes me nervous. The S&P 500 ( ^GSPC ) also moved up 0.5% to hit new records, while the tech-heavy Nasdaq Composite ( ^IXIC ) rose about 0.2%. The latest pullback in Treasury yields has lifted "futures in stock", especially in growth-sensitive sectors. If real yields continue declining, equity multiples may expand into