Ключевые слова: abstract, banknotes, board, business, cash, challenge, chess, coins, combat, competition, concepts, crisis, currency, dark, dollar, economy, european, exchange, finance, financial, gamble, game, games, global, idea, international, investment, isolated, luck, market, metaphor, money, notes, paper, par, piece, planning, play, prehistory, rate, risk, rivalry, sign, solution, stock, strategy, struggle, symbol, wealth,