An experiment that tests only one factor at a time by using a comparison of a control group and an experimental group is?

I appreciate a capitalist system which allows the market to compete unencumbered, with few restraints. However, when individuals or organizations are able to dictate with life-threatening decisions based on money and not humanity, then I call for a revolt. The pleasures of love and life, a marriage bound by sacred vows, surely these things possess a value which far outweigh the interests of someone who is unwilling to part with their commodity. If there is no room for compromise from the pharmaceutical industry for delayed payments or payments with interest over time, then I say steal the drug.