  Free exchange  Middle-income claptrap  Do countries get
“trapped” between poverty and prosperity?  See article  Readers'
comments    The answer to this question is, it's unknowable. Get
back to me when you've tested it on a country of 1.3 billion.
She Gin Ping  Several issues make accurate prediction difficult.
There is the whole shadow/black economy. To take nation states
who collect data as the unit in a globalised era may be
misleading,Regions and city states may be more relevant.  For
examples Hong Kong/Guanzhou the Pearl River Delta includes Aomen
(Macao Autonomous area,Zhuhai and Foshan and Shenzhen in a trans
border super economy.Or Tijuana San Diego,The Oresund Kobenhavn-
Malmo or Bratislava-Vienna.  If trying to make a gloabal
analysis it may be a false premise to omit the upper and lower
quartiles.The actual difference may need to factor in town and
country or land tenure,life expectancy or climate. While at the
rich and micro state end we have distortions of war,fuels and
off shore banking.  An i