From Rise: The Vieneo Province
Consumer Goods represent the durable electronics industry. These are for trade between players and also factor into the cost of new vehicles. They are not currently necessary for day to day use of colonists (unlike non-durable goods) and can not currently be manufactured.
Since the amount is constant, it is a good overall indicator of the economic stability. As the game proves the underlying economic theory, the Consumer Goods may take a new direction.