After doing this, you will now analyze some of the differences that occurred across periods 1-4 (where quality was known by both the buyer and sellers) and periods 5-7 (where quality was only known by the sellers). Your explanation should be around one paragraph in length and it should address the following questions: How does the quality grade of the units traded change across these two treatments? What about the total number of trades that occurred? What about the average transaction prices? Describe any differences that you observe across the two treatments