How did the economy of west europe change after the crusades

How has china attempted to increase its gdp since the end of the 20th

Which steps are important when designing and conducting a scientific experiment? hide the results from fellow scientists. identify the independent variable. eliminate all dependent variables. address any confounding variables. form a non-falsifiable hypothesis.

Give an example of a situation in which an individual's pursuit of economic self-interest may not benefit but instead harm the rest of society