Why is compound interest preferable to simple interest? compound interest pays at least double the interest on the principal during each month. compound interest is paid by the week or by the month, not only once during a year. compound interest is based on the entire principal, not just a percentage of the principal. compound interest pays interest on the principal and the interest earned in each period.

When cell phones were first entering the market, they were relatively large and reception was undependable. all cell phones were essentially the same. but as the technology developed, many competitors entered, introducing features unique to their phones. today, cell phones are only a small fraction of the size and weight of their predecessors. consumers can buy cell phones with color screens, cameras, internet access, daily planners, or voice activation (and any combination of these features). the history of the cell phone demonstrates what marketing trend?