Definition and Basic Structure of Futures
A futures contract is a standardized agreement to buy or sell a specified asset at a predetermined price on a specific future date (expiration month). Futures are traded on exchanges, and a clearinghouse guarantees performance. Underlying assets span stock indices, bonds, currencies, crude oil, gold, agricultural commodities, and more. In Japan, the Nikkei 225 futures on the Osaka Exchange are the most actively traded.
The defining feature of futures is the margin system. Rather than putting up the full contract value, traders deposit a fraction (typically 3-10%) as margin. For the Nikkei 225 futures (large contract), one contract equals the Nikkei average × 1,000 yen. At a Nikkei level of 38,000, the notional value is 38 million yen, yet the required margin is only about 1.5-2 million yen - roughly 20x leverage.
Hedging and Speculation in Practice
The original purpose of futures is hedging. For example, an institutional investor holding a 100 million yen equity portfolio who wants to protect against a market decline can sell Nikkei 225 futures. If the Nikkei drops 10%, the short futures position generates roughly a 10% gain, offsetting the portfolio loss.
For speculators, the appeal is the leverage that allows large positions with small margin deposits. With 2 million yen in margin and one long Nikkei 225 futures contract, a 1,000-point rise in the index produces a 1 million yen profit (50% return on margin). But a 1,000-point decline means a 1 million yen loss - half the margin wiped out. Further declines trigger margin calls, and losses can exceed the initial deposit.
Common Misconceptions and Practical Risk Management
The biggest misconception is that 'futures = gambling.' Futures markets serve critical economic functions: price discovery and risk transfer. Airlines hedge fuel costs, food manufacturers lock in raw material prices, and exporters manage currency risk - all through futures. Introductory books on margin trading risk management are available on Amazon
For individual investors trading futures, recommended risk controls include keeping position sizes within 10% of total assets, always setting stop-loss orders, and limiting leverage to 5x or less. Be aware of rollover costs when switching between expiration months and of heightened volatility around SQ (Special Quotation) settlement dates. Futures demand advanced knowledge and experience, so thorough study and starting with small positions are essential.