1. Why do countries GDP DIFFER?

2. GDP REVIEW
Gross Domestic Product shows us how well or poor a country is doing economically.
It measures the total value of goods and services that are produced in a country in a year
GDP per capita is the total income of a country divided by the number of people who live in that country. It shows how much people make on average at work.

3. Canada United States Niger Germany
Country size
9,984,670 sq km
9,833,517 sq km
1.267 million sq km 
 357,022 sq km 
Population
35,881,659
329,256,465
19,866,231
80,457,737
Natural resources
Bauxite (makes aluminum), iron ore, nickel (coins, pipes and batteries),zinc (batteries, plastic), copper (wiring, car motors), gold, lead (car batteries, weights for lifting, ammunition, paint), rare earth minerals, molybdenum (missile and aircraft parts, nuclear power industry), potash (fertilizer in agriculture and soap), silver, wildlife, hydropower, fish, timber, oil, coal, diamonds- 19 total
coal, copper, lead, molybdenum, phosphates (fertilizer and animal feed supplements), rare earth elements, uranium (nuclear power plants and weapons), bauxite, gold, iron, mercury, nickel, potash, silver, tungsten, zinc, petroleum, natural gas, timber, arable land, note, the US has the world's largest coal reserves with 491 billion short tons accounting for 27% of the world's total-20 total
uranium, coal, iron ore, tin, phosphates, gold, molybdenum, gypsum, salt, oil-10 total
coal, lignite(type of coal used for steam powered industries), natural gas, iron ore, copper, nickel, uranium, potash, salt, construction materials, timber, arable land-12 total 
Arable land
4.7%
16.8%
12.3%
34.1%
urbanization
81.4%
82.3%
16.4%
77.3
Physician Density
2.5 doctors/1000
2.57/1000
.02 doctors/1000
4.19/1000
Life expectancy
82 years
80.1 years
56.3 years
80.9 years
Literacy Rates
99%
19.1%
School life expectancy
16 years
17 years
5 years
17 years 
GDP per capita
$48,400
$59,800
$1,200
$50,800

4. What Accounts for the differences in GDP?