Principal Risk, Replacement Cost and Liquidity Risk

Settlement risk is usually broken down into three types, and it helps to keep them distinct. Principal risk is the risk of losing the full value of a transaction, because you have delivered your side and received nothing in return. This is the most severe form, and it is the risk that Herstatt's counterparties faced. If you pay one hundred million and receive nothing, the loss is one hundred million, not just the profit on the trade. Principal risk is the main target of payment versus payment mechanisms. Replacement cost risk, also called market risk in this context, is the risk that if your counterparty fails before settlement, you will have to replace the transaction in the market at a worse price. For example, if you agreed to buy dollars at a certain rate and your counterparty fails, you may have to buy them again at a higher rate, and the difference is your loss. Replacement cost risk is usually smaller than principal risk, but it can still be large when markets move sharply. It exists from the moment a trade is agreed until it settles, and it grows with the time to settlement. Liquidity risk is the risk that settlement is delayed, leaving you short of funds you were expecting to receive. You may not lose the principal permanently, but you may need to borrow at short notice, delay your own payments, or sell assets at a discount to cover the gap. Liquidity risk is often underestimated, because it does not show up as a direct loss, but it can be the channel through which a single failure spreads to other banks. A bank that expected to receive funds in the morning and does not receive them until the afternoon may queue its own payments and contribute to gridlock elsewhere. The Herstatt case is the textbook example, and the numbers make it concrete. On 26 June 1974, Bankhaus Herstatt in Germany received Deutsche Mark payments from its counterparties in the morning, then the German regulator closed the bank at 15:30 Frankfurt time, before Herstatt had paid out the US dollars it owed. Counterparties had delivered their side and received nothing, losing the full principal on trades worth hundreds of millions of dollars. The loss was not a market move or a bad trade, it was the simple fact that the two legs of a foreign exchange trade settled at different times in different countries. That time gap is principal risk, and it is the reason payment versus payment exists. Banks measure the three risks differently, and a BA should know how. Principal risk is measured as the gross value at risk on unsettled trades, usually the full amount of the currency leg that has been paid but not yet received. Replacement cost risk is measured as the cost of replacing the trade at current market prices, which depends on how far the exchange rate has moved since the trade was agreed. Liquidity risk is measured as the funding gap, the amount the bank would need to borrow and for how long if expected receipts did not arrive. Each measure feeds a limit, and each limit feeds a daily report to risk management, so the numbers must be defined precisely in requirements. For a BA, settlement risk work is about the controls that reduce each risk type. Principal risk is reduced by payment versus payment, which is why CLS membership and the choice of settlement method belong in requirements. Replacement cost risk is reduced by shortening the time between trade and settlement, which is why same day settlement and netting matter. Liquidity risk is reduced by forecasting, by intraday credit lines, and by queue management. The BA should be able to write a requirement that says which risk each control addresses, how the risk is measured, and what happens when the limit is breached, because a control without a measure is a hope, not a control.