The Financial Conduct Authority (FCA) warns people about the risk of investing in cryptocurrencies, referencing price volatility, product complexity, charges and fees, marketing materials and consumer protection. 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Although this test successfully detects single isolated bubbles, Phillips, Shi, and Yu [24] acknowledge it may suffer from reduced discriminatory power when applied to time series with multiple occurrences of bubbles. To overcome this weakness, a further enhancement was proposed, as a new method, called a generalized supremum ADF (GSADF) test. This test allows both the start and end points of data subsets to vary, which in turn enables the identification of multiple bubble regimes in one observed time series. The GSADF test is defined by

While its price had fallen slightly from a 24 hour high of $68,525 on Tuesday morning to $67,983.80 as of 2.10pm, Bitcoin’s price hike still represents a year-on-year increase of more than 300% on last November’s value.
Mortgage Rates Hit a New 5-Month Low at 2.88%. Why the Lowest Rates You See Aren't What You'll Get