The study of marketing processes, activities, institutions, and results from a broad perspective such as a nation, in which cultural, political, and social, as well as economic interaction are investigated. It is marketing in a larger context than any one firm.
Primary instrument. A primary instrument is a scientific instrument, which by its physical characteristics is accurate and is not calibrated against anything else. A primary instrument must be able to be exactly duplicated anywhere, anytime with identical results. Pressure.
All instruments such as drums and bells fall into this category. The formal classifications of most percussion instruments are either idiophones (instruments that vibrate when struck, shook, plucked, or scraped) or membranophones (instruments that have a stretched membrane that vibrates when struck, shook, or rubbed).