Since scarcity is when the supply of a product goes low
the price goes up when the supply of a product is down
Well if you mean what does the controlled part of a scientific investigation, it is the part of the investigation that will be your control or your base, untouched, original, data and such.
Rosario (Spanish pronunciation: [roˈsarjo]) is the largest city in the province of Santa Fe, in central Argentina. It is located 300 km (186 mi) northwest of Buenos Aires, on the western shore of the Paraná River.