At its simplest, biotechnology is technology based on biology - biotechnology harnesses cellular and biomolecular processes to develop technologies and products that help improve our lives and the health of our planet.
In macroeconomics, the focus is on the demand and supply of all goods and services produced by an economy. Accordingly, the demand for all individual goods and services is also combined and referred to as aggregate demand.
Normative Economics. Economists like to distinguish between Positive Economics and Normative Economics. Positive Economics describes how things work. For example, if prices go up, demand will go down. Normative Economics describe what should be. Normative Economics seeks an ideal economic system. When I was training in economics, my teachers all preferred to concentrate on Positive Economics.