Record margin debt can amplify a selloff: falling prices reduce account equity, triggering margin calls and forced sales that push prices lower still.

AI-linked firms are becoming important in both stock and corporate-bond indexes. Owning two asset classes does not guarantee diversification when both load on the same economic factor.

The low-volatility anomaly challenges a simple reading of CAPM: portfolios with lower realized volatility have sometimes earned higher long-run returns. The question is whether the pattern is mispricing, omitted risk, or a trading constraint.

Appraisal arbitrage turns a merger-price disagreement into a trade, but the payoff depends on a court’s valuation and the time to resolution. It is a useful contrast with a textbook riskless arbitrage.

The AI thesis combines rising earnings expectations with extraordinary capital spending. Valuation depends on whether the new investment creates sustainable free cash flow rather than revenue growth alone.

Investors can obtain duration and curve exposure with cash bonds, swaps, or listed futures. The economic exposure may be similar, but contract choice adds basis, roll, liquidity, and implementation differences.

A change in the relative price of calls and puts reveals how investors value upside participation versus downside protection. Option prices can therefore show risk preferences that the index level alone hides.