Difficulty is defined by (a) frequency of use, (b) frequency of spelling pattern, and (c) developmental norms. It is not difficult, then, for teachers to place students with words of appropriate difficulty based on simple measures of instructional level (Schlagal, 1996).
If one assumes that shifts in the supply curve of ethanol are solely due to the changing price of corn, then, up to an ethanol price of $2.90, the price of corn completely determines the price of ethanol. In other words, the price of corn drives the price of ethanol, not the other way around. This is actually quite logical since the amount of ethanol used is essentially fixed; consequently, something else must be driving the price of ethanol.
Prices In conjunction with the drop in crude oil prices, the world ethanol price is projected to decrease from USD 59.7/hl in 2014 to USD 51.7/hl in 2015. It should then increase over the projection period to reach USD 60.3/hl by 2024 (Figure 3.7). Expressed in real terms, the world ethanol price is expected to be 17% lower in 2024 than its 2014 value. Several factors are expected to influence the level of ethanol prices.