How can the individual make up their mind when they are being sold fake (or even worse, adulterated) prescription drugs (as happens all the time in countries that don't regulate them carefully)? Unless everyone has their own home gas chromatograph that's just not going to work... nice troll, but no thanks.
Do you know WHY Canada, Europe, Australia, Japan, etc all have drugs at 1/10th (or less) of the cost of the US? Because they are single-payer. In a monopsony the buyer has a lot of control on the price, as opposed to the US where the drug monopolies have free reign.