Complex sentence: The researchers suggested that the denomination effect may involve imposing self-constraints or incentives to alter future behavior, noting a large denomination can serve as a precommitment mechanism to prevent the urge to spend compared to small denominations.
Split into simpler sentences: The researchers suggested that the denomination effect may involve so-called "precommitment"; in other words, the imposition of self-constraints or incentives to alter future behavior. They wrote that a large denomination can serve as a precommitment mechanism to prevent the urge to spend compared to small denominations.