First, restaurants are inevitably going to try to do a 'Starbucks' and sell you the sizzle, instead of the great price.
Second, tell us again how governments and central banks can make inflation go up. Is it those bridges to nowhere?
Third, I've heard elsewhere that the manipulators are trying to decrease the store of value value of money. If that coupon, or ten-spot, expires in 6 months then you will get busy and try to get value out of it before it expires. It is a sort of theft, and count on people trying to do that to you.