More is always preferred to less" refers to A) choices between work and leisure. B) choices between happiness and utility. C) choices between consumption and work. D) choices between consumption and leisure. E) more consumption and less leisure. 30) The marginal rate of substitution A) can be computed by measuring the slope of the indifference curve. B) can be computed by measuring the curvature of the indifference curve. C) cannot be deduced from the properties of the indifference curve. D) can only be computed if we know the prices of all goods. E) can be deduced from the budget line