On the basis of that observation...which is true; generics do not spend as much developing their products. In fact, from the research I've seen, the average cost of developing a new drug is more than $800 million U.S. One in 10,000 molecules discovered actually makes it to the market as a successful drug product, and only 30% of the ones that do make it either match or exceed enough revenue to cover those R and D costs.
With that in mind, for generic drugs it's only a few million dollars, at best, to copy somebody else's invention. You would expect their prices to be lower, but in fact we find them to be much higher. Ontario reimburses these drugs at 70% of the price of a brand-name drug. Clearly their R and D costs are not 70% of the R and D costs of a brand-name product.