Better is related to Heal. Heal is the opposite of Harm. Harm is related to Damage. 
Customer is related to Consumer. Consumer is the opposite of Producer. Producer is derived from Produce. Working can cause/lead to Produce. 
Better <--RelatedTo--> Heal <--Antonym--> Harm <--RelatedTo--> Damage 
Customer <--RelatedTo--> Consumer <--Antonym--> Producer --DerivedFrom--> Produce <--Causes-- Working 