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Tom Yeung here with today’s Smart Money.

When investors get excited, that excitement rarely stays contained to a single corner of the market.

Money flows into one hot asset, early investors make fortunes, and suddenly everyone starts looking for the next big winner. Before long, the optimism spreads. Stocks rise, speculative bets multiply, and assets that seemed unrelated begin moving higher together.

That’s one reason I pay attention to Bitcoin (BTC-USD). Over the years, the cryptocurrency has served as a surprisingly useful barometer of investor enthusiasm. When speculative money starts flooding into Bitcoin, it often signals that investors are becoming more willing to take risks elsewhere as well.