Measuring Population, Migration, and TFR

Today in class we mainly talked about three things.  Those things were Measuring Population, Migration, and total fertility rate or TFR for short.  Measuring population has to do with thing called crude birth rate.  Crude birth rate is the number of births per 1000 of the population.  To get the rare of natural increase you have to subtract death from birth rate.  The second thing we talked about was migration.  Net migration is the difference between the number of people entering and leaving a country during a year.  When you enter a county it is called immigration with an I.  When you exit a country it is called emigration with an E. So if you are immigration you are emigrating as well.  There are many reason why people migrate.  These can be things like war, unemployment, health services and freedom.  The last thing we talked about was TFR which is the number go children born per woman.  For the population to stay the same, the TFR has to be a 2.1.