Final answer:
Ethan bought 2/3 pounds of coffee this week, which is 1/3 of his usual 2-pound purchase.
Step-by-step explanation:
Ethan usually buys 2 pounds of coffee every week, but this week he bought only 1/3 the usual amount. 
To find out how much coffee he bought, we need to calculate 1/3 of 2 pounds: 
1/3 of 2 pounds = 2 pounds × (1/3)
 2 pounds × (1/3) = 2/3 pounds of coffee
 Therefore, Ethan bought 2/3 pounds of coffee this week, which is less than his usual purchase amount due to the reduction.