My thoughts The decision of the Indian government to buy 36 Rafales will cost between $7 billion to $11 billion. Estimating the service life of rafale to be 20 years and estimating he cost of maintenance to be 3 times the cost of acquisition, lets assume the cost of total acquisition and maintenance to be $35 Billion. This aquisition will wipe out half the fleet of the Tejas, like the acquisition of F-22 has decreased the numbers of fighter planes in the USAF. Rafale has a twin engined fighter will cost more for a hour of flight, so the running costs for the rafale will also be high.This will affect pilot training as funds are fungible and IAF will cut the cost on training and acquisition of other assets. Rafale will also spend more time in maintenance due to twin engines.Funds needed for endogenous fighter will aslo get affected. Rafale overall will be verybad for the IAF.