No... There is no limit to the value of changes that the company and union agree to, but there is a vague limit on the value of changes that arbitrators can impose if any items go to arbitration.

"The arbitrator’s award specifically shall adhere to the economic terms of the MTA . . ."

That's the actual language in the MOU; it doesn't set a specific value, so it's up to the arbitrators, I suppose, to decide how much change would be allowed to still remain within the economic terms of the MTA.