Question

during the 1920s, people would buy stock on margin, which meant that they bought it on speculation. bought it on credit. paid in installments. paid cash for it.

Explanation:

Comprar acciones a margen significa que los inversores pagan una parte del precio del activo y el banco o el corredor cubre el resto. Esto es similar a comprar algo con crédito, ya que se está pidiendo un préstamo para financiar la compra.

Answer:

bought it on credit.