What are some cultural expectations when it comes to funerals?

What are some cultural expectations when it comes to funerals? It has been said that more money spent on a funeral can symbolize how loved an individual was. Do thoughts on this? Has society pressured bereaved individuals into believing that elaborate services are necessary? What are some other societal expectations we should keep in mind?

Any and all scientific resources are welcomed. I am having difficulty locating sources that are 10 years old or younger.