Read the following article and discuss why production of oil in Alberta continues to rise despite major companies making losses as a result of sharp declines in oil prices and why this is not sustainable in the long run. https://insideclimatenews.orgews/23022016/tar-sands-becoming-worthless-production- rises-even-prices-plummet (https://insideclimatenews.orgews/23022016/tar-sands-becoming- worthless-production-rises-even-prices-plummet) You should discuss the reasons in terms of: 1) marginal cost 2) the difference between "sunk costs" and "avoidable costs" 3) the difference between fixed cost and variable cost 4) the difference between the short run and the long run