Merchandising and Inventory Merchandising involves selling inventory. Inventory is usually an important asset. Inventory must be accounted for periodically or perpetually. Traditional periodic method is often being replaced by perpetual inventory accounting c8-6C8 - 6 Merchandising and Inventory Merchandising involves selling inventory. Inventory is usually an important asset. Inventory must be accounted for periodically or perpetually. Traditional periodic method is often being replaced by perpetual inventory accounting