Research by James Byers on the Relationship Between a Native

question 1

Multiple Choice

Research by James Byers on the relationship between a native and an invasive species of mud snail

• A) demonstrated that the invasive species Batillaria grows faster than the native species Cerithidea.
• B) demonstrated that at high densities Batillaria continued to grow at a relatively high rate while Cerithidea lost weight.
• C) indicated that Batillaria is much more efficient at converting available food into its own biomass.
• D) predicts a time to competitive exclusion of Cerithidea by Batillaria of 55 to 70 years.
• E) All of the choices are correct.

---

Definitions:

Aggregate Expenditure

The total amount of spending in the economy that includes consumption, investment, government purchases, and net exports.

Simple Spending Multiplier

The ratio of a change in real GDP demanded to the initial change in spending that brought it about; the numerical value of the simple spending multiplier is 1/(1 + MPC); called “simple” because only consumption varies with income.

Marginal Propensity

Describes the portion of additional income that an individual is willing to spend on consumption rather than saving.

Off-Balance Sheet Financing

Off-balance sheet financing is the use of funding or financial activities not recorded on the company's balance sheet to keep debt ratios low.