'how much costs' is not correct or usable in written English.
You would instead say 'how much does it cost' or 'how much it costs'. Example: I need to know how much it costs to buy a new car.
How much costs may change, however, depends on how many people would have to leave the market, which there isn't much data on.
But how much costs escalate is at least in part within our control, and that matters a lot for federal and state budgets, employers and families.
O.K., now put that comparison aside and take a look at how much costs have increased in the past nine years – the period over which there has been no increase in railway ticket prices.
The California Association of Health Plans, a trade group representing 39 H.M.O.'s in the state, said that it could not predict how much costs might rise, but that increases appeared likely.
It is difficult to predict how much costs can be reduced as the market expands and as the design of the product is improved by increasing production efficiency with new techniques.
We don't know how much medical costs would fall if people had to pay more out of pocket, as conservatives advocate, or how much costs would fall if Medicare tried to crack down on dubious care, as the Obama administration prefers.
