Why some stocks may be hard to borrow? Please write down some reasons.For examples:

Short supply Beyond Meat is the most expensive stock to short among those with more than $100 million in short interest COMPANY SHORT INTEREST BORROW FEE Beyond Meat $502 million 68% Health Insurance Innovations $232 million 56% Moderna $240 million 46% New Age Beverages $118 million 39% Lyft $1.2 billion 26% Accelerate Diagnostics $290 milion 21% GTT Communications $314 million 17% Overstock.com $160 million 15% Akcea Therapeutics $147 million 14% J.C. Penney $114 million 13% Trupanion $344 million 13% Ziopharm Oncology $181 million 11% Pareteum $105 million 10% Shockwave Medical $163 million 9% Zoom Video Communications $428 million 6% Source: S3 Partners