Abstract
This paper investigates the impact of margin requirements on the trading activity in the gold and silver futures markets. We extend prior research in at least two ways. First, we examine the role of time to contract-expiration in the relationship between margin levels and trading activity. We make the case that such an examination will reveal the nature of the costs that margins impose on futures traders. Second, we examine the impact margins have on the makeup of traders in futures markets. The evidence indicates that trading activity becomes more sensitive to margin changes as one gets closer to contract maturity, consistent with the notion that margins impose important transaction (rather than opportunity) costs on futures traders. Further to this evidence, we find that speculators and small traders, typically illiquid, are especially sensitive to margins. The data also indicate that margins are likely to be hiked following periods of increased volatility, and reduced following periods of relative stability, suggesting that margin alterations primarily serve as insurance to the futures exchanges.
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