Define proof? 100 is the number. Do you really think it's 1? Anything under 100 is change like coins are to bills. There's enough games played. Want proof? Watch right when After Hours starts with a stock that has good volume during the day, you'll see single digit trades and double digit trades this is the MM getting some balance from all the 1's,36's ,68's, 15's (pieces) etc. to get it to group or stacks of a 100. That is the common base number which the deal in, anything lower than 100 are just pieces (the change). When you read the tape you will see the pieces on Time and Sales but the pps will not change unless you see over 99 hence 100 or more. Please don't ask or comment that "the closing price doesn't change though"