How does the vote decide it?
It decides half of it. Members legislate on a ranked ballot, then the market gets a window to object to what they passed. Neither phase alone moves the money.
Phase one, the ballot. A proposal carries a short slate of options, one of which is always “Do nothing”. Holders rank every option, and each ballot counts with its voter's earned vote weight. Once voting closes, anyone can send the count. The leading option passes only if it clears a supermajority of the weight cast, a bar that is higher when there are fewer options, and a leading “Do nothing” passes nothing. There is no turnout quorum: the bar is a share of what was cast, not of what exists. Voting has the detail.
Phase two, the window. A pass on the ballot executes nothing. Anyone can then open the market window, which records the token's recent average price as the baseline. During the window holders trade or do not; selling pushes the price down, buying pushes it up.
After the window closes, anyone can resolve it. If the average price across the window is at or above the baseline, the proposal has passed; below, it has failed. The test uses the whole window rather than the price at the moment someone resolves, so moving the verdict means holding the price down or up for a real share of the window, and a buy and sell wrapped around the resolving call achieves nothing.
A proposal needs an active supermajority of the weight cast to get anywhere, so silence on the ballot kills it. Once it has that, silence in the window is assent: the only people who can block a spend they lost the vote on are those willing to sell over it, who are also the people who bear the cost if the spend is bad.
The design buys three things a ballot alone cannot. Buying the second phase means buying the token itself and holding it through the window, which is expensive. The window reflects everything the market learned after the vote, including anything the proposal's author did not disclose. And a decision that was right when it was taken can still be stopped if the facts change before it executes. This is the trade-off covered in optimistic governance, with a market in place of a bonded challenger as the veto.