Marginal efficiency of capital : The percentage yield earned on an additional unit of capital. Resiliency: Speed with which new orders respond to a change in prices. Macro country risks: Country risks or political risks that affect all foreign firms in a host country. Smidge: Small amount of price, usually +/- 1/8 or 1/4. Investment certificate: A document that serves as proof that an individual has an investment in a savings and loan association.