1) Agio 2) Charge 3) Exchange premium 4) Premium 1) Agio 
playing the stock market; speculation
• (n.) Exchange business; also, stockjobbing; the maneuvers of speculators to raise or lower the price of stocks or public funds.
Ag'i·o·tage noun [ French agiotage , from agioter to practice stockjobbing, from agio .] Exchange business; also, stockjobbing; the maneuvers of speculators to raise or lower the price of stocks or public funds. « Vanity and agiotage are to a Parisian the oxygen and ...
agiotage The business of dealing in foreign exchange.
the business of dealing in foreign exchange.