In economics, we have learnt that related good's price does matter. Given the budget constraint and

everything else remains the same, an individual consumer switches to relatively cheaper goods (also

known as substitution effect).

Often when you visit a chemist shop with your doctor's prescription, your pharmacist may ask whether

you are interested in buying a relatively cheaper drug (which is biologically equivalent to your prescribed

drug) if it is available. Read the article carefully titled "Economists throw doubt on generic drug price advantage over branded version".1 Explain what seems to be a problem that may arise when one

switches to a cheaper drug.