Exponential growth implies that the rate of growth increases as time passes. So, it's not that "one cell" becomes "two cells" in two seconds and "three cells" in three seconds - that's linear growth....
Both Internal Growth Rate and Sustainable Growth Rate refer to the amount of growth (defined as profitable increase in revenues) a business organization can achieve without having to resort to...
How much a population increases per unit time. The growth rate can also be expressed as growth per unit time divided by the population - for example, so-and-so much increase per year.