What are the effects of elasticity of demand on marketing decisions?

Q- how it is Effects of elasticity of demand happen? what is the relationship with marketing decisions? can large firms have a capability to link between elasticity of demand and marketing decisions? 

(raise the price, cut the price, pay more , pay less and special offer )what is the pricing strategy and what is the relationship with elasticity of demand?

I need it after 10 days in 11 Pages