Product costs: are the expenses incurred for specific transactions or events such as production of goods, and are recognized at the time of revenue recognition (ex.COGS)
Period costs: are the expenses incurred for service for a certain time period (ex.Storehouse rent, admin exp) Other expenses: are incurred for some assets for certain period in order to get benefits in the future years. (ex. Depreciation exp)
Other expenses: are incurred for some assets for certain period in order to get benefits in the future years. (ex. Depreciation exp)