From the Designer's Website:
La bourse, ou la vie.
User Translation from French:
The stock market or life.
Characters have 150% distributed between three attributes expressed as percentages: complicité (complicity), compétence (competency), reconnaissance (recognition). A fourth attribute, autorisation (authorisation) is calculated as 10 to the power of one-tenth of reconnaissance, and represents their budget limit in euros.
Each day a character can bet an amount of money up to their authorisation level. If they succeed in rolling less than or equal to their complicité on percentile dice then they have influenced middle or back office staff, instead allowing them to invest up to 10 times as much. The player then guesses either the parity (odd or even; doubling their wager if correct; losing their wager if incorrect) or exact value (tripling their wager if correct; losing double their wager if incorrect) of the market conditions. Players can attempt a compétence check to modify the result, hoping to either increase gains or reduce losses (and doing the opposite if they fail on their roll).
Market conditions are determined by the GM in line with certain rules, starting at 0, ranging from -10 to +10, and varying according to rolls of a ten-sided die.