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.
This is due, in large part, to the use of ethanol as an octane-boosting ingredient.â Elaborating he said, alcohol oxidizes and emulsifies to form non-combustible byproducts. Over time these can build up in fuel injectors, on the backsides of intake valves and throughout an engineâs combustion chamber. âThe result [of this] is loss of engine performance, reduced fuel economy, increased emissions, hard starts, etc.,â Barker said.