What aspect of the trading day is constituted by pre-market and after-hours sessions?

• A. They extend the window during which standard hours can be traded.
• B. They are unrelated to the main session and rarely used.
• C. They are illegal in most markets.
• D. They occur only for bonds, not stocks.

Answer: (A)

Pre-market and after-hours sessions extend the window during which stocks can be traded beyond the regular session. They let traders place and execute orders before the market opens and after it closes, effectively lengthening the trading day. Because participation is thinner outside the standard hours, liquidity is lower and price moves can be more volatile, often with wider spreads. These sessions are legal in most markets and apply to stocks, not just bonds, so they truly extend the trading day rather than being unrelated or restricted.