What is the ruling on speculation in the stock market by buying and selling currencies with the possibility of profit or loss, and what is the ruling on another person carrying out the speculation in exchange for a fixed amount for each transaction?

If speculation in the stock market, meaning the buying and selling of currencies, adheres to Sharia guidelines, then it is permissible. The possibility of profit or loss does not affect the ruling, as this is the nature of such transactions. The buying and selling process can either be undertaken by the owner of the capital himself, or he can appoint another person. In the latter case, this can be either for a shared, unspecified percentage of the profit (Mudarabah in its jurisprudential sense), or for a specific, predetermined amount (Ijarah), and both are permissible.