Commodities Explained / Risk & Portfolio Strategy
Connect the size of a position with cash losses, trading conditions and the ability to exit when conditions change.
Translate every percentage into money
A percentage sounds abstract until it is applied to a position. For an unleveraged holding worth 10,000 dollars, a 15 percent decline is a 1,500 dollar loss before costs. With derivatives, calculate from contract exposure and price changes rather than from the margin deposit.
Write down both the planned position value and the cash loss under several adverse scenarios. The scenarios are assumptions, not estimates of the maximum possible loss. Include a more severe case than the one that feels comfortable.
A risk budget is a constraint, not a promise
Suppose a hypothetical researcher sets a 500 dollar loss budget and models a 10 percent decline. Dividing 500 by 0.10 gives a 5,000 dollar position under that single assumption. A 20 percent decline would instead lose 1,000 dollars before costs.
This calculation helps reveal sensitivity, but it does not guarantee the budget will hold. Gaps, currency changes, product features and execution can make the actual result worse. Position sizing requires judgement about those risks as well as arithmetic.
Liquidity depends on the instrument and moment
A widely followed commodity can have a less liquid investment product or contract maturity. Look at the bid and offer, available size and normal trading hours. Conditions can deteriorate around major news or outside the hours when underlying markets are active.
A limit order controls the price you are willing to accept but may not execute. A market order prioritises execution but can receive a worse price than expected. A stop order can also execute away from its trigger in a fast market. Understand the broker's specific order rules.
Combine the funding and exit plan
For futures, stress both market losses and possible margin increases. For a physical holding, consider the time required to sell and receive cash. For a listed product, review market liquidity and structural risks. These are different forms of access to cash.
Record what would cause a review, a reduction or an exit, and whether other holdings could lose value at the same time. A position that looks small by purchase price may still create a large funding problem when several exposures move together.
Put it into practice
A 5,000 dollar unleveraged holding falls 12 percent, and total transaction costs are 25 dollars. What is the hypothetical loss?
Check your answer
The price loss is 600 dollars. Including the stated costs gives a 625 dollar loss. The 500 dollar budget in the earlier example would have been exceeded.
