Don’t put all your eggs in one basket, as the saying goes. This also holds for cryptocurrencies. If one currency goes up, the other may go down, and vice versa. Hence, a basket of cryptocurrencies is expected to have a lower volatility than a single cryptocurrency: diversification reduces risk.
As the graph shows, this has been true for Bitcoin and Ethereum. Technically speaking, the correlation for the period was 0.61. This means that owning Bitcoin and Ethereum would have reduced risk compared to only investing in one or another.
Daily Returns of Ethereum and Bitcoin
Source: VanEck Analysis, based on daily return data. Data for the period 1/1/2021 – 21/3/2021. Past performance is not a reliable indicator for future performance. This also holds for historical market data. Correlation levels may change over time.