U.S. stock futures were rising early on Tuesday following a selloff in the previous session as eroding investor risk appetite slowly returned at the start of December, historically a strong period for markets. Stocks dropped on Monday as risk sentiment weakened across markets, characterized by a deep selloff in Bitcoin and other cryptocurrencies. The possibility of an interest-rate hike in Japan—which could shift significant Japanese investments abroad—saw U.S Treasury yields spike, contributing to the selloff in equities.