http://cms.gavirtualschool.org/Shared/Electives/MarketingPrinciples2014/MarketingPrinciples_Pricing_Shared/PricingVocabulary.pdf 
http://cms.gavirtualschool.org/Shared/Electives/MarketingPrinciples2014/MarketingPrinciples_Pricing_Shared/Pricing.pdf