Clarified Auditing Standards require quantification of materiality levels, which are estimates to guide auditors' decision-making and design of auditing procedures. This estimate is only a guide and is not a specific determination of what is, and is not, material in an audit.
1 The current population of the United States of America is 324,385,585 as of Friday, August 12, 2016, based on the latest United Nations estimates.  the United States population is equivalent to 4.38% of the total world population.
This graph shows population projections for the United States of America. The estimated population of the USA in 2050 is 398 million residents.