Suppose stock A and stock B are negatively correlated. Then, it is not possible for both stock A and stock B to have positive market betas

Suppose the expectations hypothesis for forward rates holds: that is, all forward rates are expectations of future spot rates. Suppose the date is 2023. f 2023 2025,2027, the interest rate for a forward contract today (2023), which lends in 2025 and gets money back in 2027, is 5%. Suppose the expectation of f 2024 2025,2026 today (in 2023) that is, the interest rate for a forward contract made in 2024, which lends money in 2025 and gets money back in 2026, is 3%. Then the expectation today (in 2023) of f 2024 2026,2027 that is, the interest rate for a forward contract made in 2024, which lends money in 2026 and gets money back in 2027 cannot be smaller than 5%

Suppose wheat costs $3 per month to store. It would not be possible to observe a situation where the June 2023 wheat futures contract trades at $8, but the July 2023 contract trades at $4, since this would represent an arbitrage opportunity: it would be possible to trade futures and spot wheat, and store wheat, in a way which guarantees a risk-free profit

Suppose ALZ stock is trading at $5, and pays no dividends. Consider two options. Option A is a European call option with a strike price of $7, which expires on Monday February 12, 2024. Option B is a call option with a strike price of $8, which can be exercised only on Mondays, but can be exercised on any Monday before and including February 12, 2024. If you could receive either option for free, you would always prefer option A.