I don't think that's an inherent attribute of bitcoin, it's based entirely on what types of deals brokers and traders are willing to engage in. If you buy a st

I don't think that's an inherent attribute of bitcoin, it's based entirely on what types of deals brokers and traders are willing to engage in. If you buy a stock and actually take possession of it instead of letting your broker hold onto it for you, then your shares can't be lent out. People generally don't do that because it makes it harder to buy and sell and there is usually not a realistic chance of your share being lent out actually hurting you. If you buy bitcoin and let a broker hold onto it for you, then they could lend it out. Off-chain transactions like this are becoming increasingly popular as people look to avoid increasing transaction fees.