About how many people lack access to basic sanitation?

Two important considerations during the difference-in-difference approach are

a. Representativeness, Reflectiveness b. Injections, Leakages c. Representativeness, Leakages d. Reflectiveness, Injections

What happens to wage and rental rate according to the Heckscher-Ohlin model if the price of a good that uses capital extensively increases by 6%?

a. Both wage and rental rate decrease by 6%. b. Both wage and rental rate increase by less than 6%. c. Both wage and rental rate increase by more than 6%. d. Wage rate increases by more than 6% but rental rate decreases. e. Wage rate decreases but rental rate increases more than 6%.