At the close of this market, I will look at each position in the market, take the number of digits in it (so, a $1,000 mana position is four digits) and add up all the digit counts.

If that number is divisible evenly, without remainder, by the number of participants - the market resolves YES.  Otherwise NO.  I will place an initial stake in the market because everything divides by one and no one wants a divide by zero error!

A has Ṁ 327,789 in YES, B has Ṁ 2,476 in YES, C has Ṁ 5 in NO.  

6 + 4 + 1 = 11, 11 / 3 = 3 remainder 2, market resolves NO.