Which of the following is a CORRECT statement? The inter - temporal and international substitution effect, and the wealth effect contribute to a positively sloped aggregate supply curve. The inter - temporal and international substitution effect, and the wealth effect contribute to a negatively sloped aggregate demand curve. The only variable that shifts the aggregate demand curve is the price level - all other influences are held constant. The only variable held constant along the aggregate demand curve is the price level.Which of the following is a CORRECT statement regarding EmploymenUlascuence in Canada? The number of people collecting Employment Insurance in Canada is always the same as the number unemployed as published by Statistics Canada. There is negative correlation between the number of unemployed people and Employment Insurance beneficiaries in Canada. The existence of Employment Insurance in Canada decreases the opportunity cost of being unemployed. The existence of Employment Insurance in Canada increases the opportunity cost of being unemployed