Sellers who were originally willing to supply 400 units of a good at $4 per unit are now willing to supply 800 units at $4 per unit. That change would be described as:
【简答题】Suggestions for the Use of Plastic Bags 关于使用塑料袋的建议 Restrictions on the use of plastic bags have not been so successful in some regions. 'White pollution' is still going on. Write a letter to the edito...