
This market resolves yes if, at any point before January 1, 2050, a female holds the position of head of state in Japan. It resolves no if no woman has held this position by that date. It resolves N/A if Japen ceases to exist.
Japan has two distinct leadership roles: the Emperor (head of state) and the Prime Minister (head of government). This market concerns the head of state, currently the Emperor.
A female regent acting on behalf of a male Emperor would not count.
If Japan's constitutional structure changes such that a different position becomes head of state, resolution will follow the functional equivalent.
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@Elspeth Could you add info about the head of state / head of government distinction to the description and/or title?
https://en.wikipedia.org/wiki/Government_of_Japan