which countries are considered to have the strongest economic systems why?
['Switzerland. > GCI score (1-7): 5.704. > GDP per capita: $47,303.25 (7th highest) ... ', 'Singapore. > GCI score (1-7): 5.645. > GDP per capita: $64,628.48 (3rd highest) ... ', 'United States. > GCI score (1-7): 5.544. ... ', 'Finland. > GCI score (1-7): 5.501. ... ', 'Germany. > GCI score (1-7): 5.488.']