Originally posted by Hendrix
Mr F
If I understand your question correctly.....
It is simply a nominal amount set by the exchange at the time it created the contract. Different futures contracts have different multipliers, just as different company's stock has different par values (I assume you have par values in the US?)
The exchanges don't necessarily pluck a number out of the air to decide the multiplier. The main determination (I imagine) is how big they want the contract to be. For example, 1 big S&P contract is worth $226,525 at the current closing price of 906.10, so, IN EFFECT, buying one buys you control of $226,525 worth of a basket of stocks replicating the S&P 500 index.
And if I remember correctly (NOT a given) I seem to remember they cut the multipler of the big contract a few years ago (pre E-mini days) from 500 because the contract was getting too big??