You have $X dollars to be used as promotional discount to increase your product uptake, i.e., maximize number of subscribers rather than maximize profit. You have two versions of your product, Silver priced at $19 and Gold priced at $49. How will you allocate the promotional dollars to drive most uptake? Will you discount your Silver version, Gold version or split between both?
Sidebar: I understand I have consistently advocated about profit maximization and not using price to drive volume. But let us assume you have a very good reason to do that and it is not permanent price drop but a controlled price promotion. May be you have a freemium model with a Bronze version at $0 and want to move most free customers to paying customers.
Consumer behavior research says, based on Prospect Theory (Kahneman and Tversky 1979), you are better off spending the promotional budget on discounting the lower priced version than the higher priced version. While rational economics states (assumed?) a $5 discount is the same regardless of the price, consumers look at $5 with reference to the base price. Consumers value $5 discount on $19 version more than then do the discount on the $49 version. So discounting your silver version maximizes new customers.
However there is an exception – when customers’ reference price (the price they expect to pay for similar products regardless of their economic value) is lower than the price you charge. Here the effect is reversed so you should discount the Gold version. If you are interested in understanding this case please write to me.
In either case, you are better off allocating the promotional budget to just one version and not dividing between two versions.