Case_In_Point_7th_Edition_Page001_183_2

U S.
If you tried to answer this question based on households or individuals you would quickly find yourself
mired in numerous and unnecessary calculations.
Hw many garen hses w s ere i nthe U Sastyear? Huseh ( q uest n) i
The population of the US is 300 million people. The average US household is made up of 3 people, so
we are talking about 100 million households. (You always want to work with 100 million households in the
US and 200 million in Europe.)
I’m going to estimate that 50 percent of the households are either suburban or rural. That makes 50
million households. I’ll also assume that 20 percent of those homes are apartments or condos. That
narrows us down to 40 million houses that most likely use a garden hose. Garden hoses are relatively
inexpensive, so people are likely to have a hose in the front and a hose in the backyard. That makes 80
million hoses. I want to add in another 10 million hoses, which can be found in nurseries, zoos, and other
outdoor facilities. Most of those businesses have at least two hoses.
We are now up to 90 million garden hoses. Hoses aren’t replaced every year. I’d say that they are
replaced every 3 years unless they are run over by a lawn mower or run into the business end of a dog’s
tooth. So we take 90 million hoses, divide that number by 3 and come up with 30 million garden hoses
sold each year.
Hw many pairs f bxers s are i nthe U Seach year? ( Ii n vua i q uest n) i
I’m going to start by stating some assumptions. I’m going to assume that the population of the US is 320
million, that the life expectancy is 80 years, and that there are the same number of people in each age
group (i.e., there is the exact same number of 3-year-olds as 73-year-olds). So, if you divide 320 million
by 80, you get 4 million people per age group. I will also assume a 50/50 split between men and women.
Children ages 0 - 3 mostly wear diapers, and kids ages 4 - 9 mainly wear jockey style. So we’ll focus on
the ages between 10 and 80. That’s 70 years to cover. I’m going to go out on a limb here and say that
only 10% of females ages 10 - 30 own a pair of boxers and, of that group, each might buy one pair a
year.
So:
(2 million females x 20 years) x 10% = 4 miin bxers.
Males between the ages of 10 and 20 wear them as a fashion statement, so I’ll assume that 75% of
males wear boxers and that they buy 3 pairs a year (the economical 3-pack).
them a tgether: 4 million + 45 million + 360 million = 409 million pairs of boxer shorts sold in the
A
US last year.
So:
(2 million males x 10 years) x 75% = 15 million boxers
15 million boxers x 3 pairs = 4 5miin bxers.
Of males between the ages of 21 and 80 (round off to 60 years), 50% wear boxers and buy or receive
as birthday or holiday gifts 6 pairs (2 sets of 3-packs) a year.
So: