According to the law of demand, assuming other factors are held constant

According to the law of demand, assuming other factors are held constant: as the price of bread increases, the quantity of bread demanded will increase. as the price of bread increases, the quantity of bread demanded will decrease. as the demand for bread increases, the price of bread will also increase.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.