Mathematical language is just not well understood by many people. People may possibly mistakenly use "month-to-month average" when they actually want the 'average monthly' but that doesn't change the meaning of those conditions, equally as people producing about "stationery autos" does not change the meaning of "stationery" or "stationary". https://financefeeds.com/moscow-exchange-launches-bitcoin-futures-trading-for-qualified-investors/