They respond to danger by diving rather than flying, and are in any case much less wary than ducks. Extant species range in size from the least grebe, at 120 grams (4.3 oz) and 23.5 cm (9.3 inches), to the great grebe, at 1.7 kg (3.8 lbs) and 71 cm (28 inches).hey respond to danger by diving rather than flying, and are in any case much less wary than ducks. Extant species range in size from the least grebe, at 120 grams (4.3 oz) and 23.5 cm (9.3 inches), to the great grebe, at 1.7 kg (3.8 lbs) and 71 cm (28 inches).
Noun. 1. productivity-the quality of being productive or having the power to produce. productiveness. fruitfulness, fecundity-the quality of something that causes or assists healthy growth.
Productivity is computed through the comparison of total units of output within an economy to the total units of input within an economy. Productivity is considered an important measure of an economy's ability to expand. In the United States, productivity is measured by the Bureau of Labor Statistics. The principal measure of productivity is labor productivity, which measures the productivity of an economy's workers. Step 1. Identify the real output of the economy. This statistic is typically published by a governmental statistics bureau, and is known as gross domestic product.