帮忙解一道英文的微观经济题~1)Using a properly labeled indifference graph for good A (horizontal axis) and Good B,illustrate how the indifference curves and budget lines would look to achieve a normal downward sloping demand curve for Good A.Also show the demand curve for Good A on a properly labeled graph.2)Explain what is happening with the substitution effect and income effect.3)Explain how these effects would differ if the demand curve was positively sloped.

2.income and substitution effects are used to understand the effects of a price change.whatever the direction of the income effect,with only two goods the substitution effect is always negative.the pure relative price effect the consumer to substitute away form the good whose relative price has risen towards the good whose relative price has fallen.abstracting from income effects,goods are necessarily substitutes for one another in a two-good world
even with many goods,there is always a substitution effect away from goods whose relative price has risen.however,substitution may not be towards all other goods.consumers substitute away fromm goods consumed jointly with the good whose price has risen.
这个最好能有图表,可是这里表示不出来~
3.substitution increase,demand decrease
income increse,demand increase
这个自己组织下语言