Once a seller spikes the prices of goods, services or commodities to a level much higher than is considered reasonable or fair, it is called Price gouging and is considered unfair, possibly to an unprincipled level. This laws are types of rice ceilings and often result in shortages of a scarce good.
A control group is going to be something that you don’t “experiment on or change. It is grown or watched under normal conditions. This way you have a medium to say how things are “supposed” to go.
The experimental group is going to be where you “experiment” and change the normal conditions to see what outcome will occur ( under different conditions then normal )
The relationship between the two don't have many similarities, both populations are always looking out for ones who can hurt or kill them and the other is looking out for which is the easiest to hunt. Since predators kill the prey, the predator population would be larger than the prey population.