Hellstone Bar. Hellstone Bars are made from 1 Obsidian and 3 Hellstone at a Hellforge. They are used to create Hellstone Tier items. Items made from Hellstone Bars are the highest quality craftable pre-hardmode items that require bars.
Unitary elastic means that elasticity is equal to 1. In case of price elasticity of demand, e = 1 implies that the percentage change in quantity demanded is equal to the percentage change in price of the commodity. Demand Elasticity is obviously negative. Elasticity = percentage change in quantity demanded / percentagechange in price. Even though perfect real life examples would be tough to list, a close example can be a 1$ increase in price of a good leads to a unit fall in its quantity demanded.
Elasticity is the strength of the relationship between price levels and consumer demand. A product is highly elastic if consumer demand varies considerably with price. For these products, an increase in price is likely to cause a substantial downward change in the quantity of demand. The prices of inelastic products, by contrast, do not vary considerably with price. For inelastic products, either increases or decreases in price are unlikely to change the quantity of consumer demand.