Mother is a type of Book. Book can be used for Learning. one thing you do when you Learning is Insight. 
Demand is related to Economics. Economics is related to Depression. Depression is a type of Crisis. Crisis is related to Critical. 
Mother --IsA--> Book --UsedFor--> Learning --HasSubevent--> Insight 
Demand <--RelatedTo--> Economics <--RelatedTo--> Depression --IsA--> Crisis <--RelatedTo--> Critical 