Contract specifications typically include all of the following except?

Contract specifications are crucial elements that define the terms and conditions under which a commodity futures contract is traded. These specifications provide important information about the contract and are essential for traders to understand what they are dealing with.

The underlying asset refers to the physical commodity or financial instrument that the contract is based on, which is vital for understanding what is being bought or sold. The contract size specifies the quantity of the underlying asset that the contract will cover, ensuring that parties involved know the scale of the transaction. The expiration date indicates when the contract will mature, at which point the terms of the contract must be fulfilled.

Broker commissions, on the other hand, are not part of the contract specifications. Instead, they are transaction costs incurred by the trader when executing trades through a broker. These fees are separate from the actual parameters of the contract itself and are negotiated independently of the contract's specifications.

Hence, while the first three elements are integral to understanding and managing a commodities contract, broker commissions fall outside the scope of contract specifications, making it the correct answer.