Supermarkets providing free plastic bags to all customers seemed to he a win-win situation for both the supermarkets and the consumer. The plastic bags were extremelv cheap, costing the supermarkets almost nothing; while allowing the consumers to louvr more and easilv carrv their products out. However, over time, societv has discovered that plastic bags have been polluting our oceans, killing sea life, and causing irreparable damage to the environment. The damage plastic bags have caused is a good example of: O Marginal Propensitv to Consume O Marginal Pricing 0 Positive Ezwrternalitvr O Negative Evternalitvr 0 Recession