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Both vertical readings are OK. One is "if the average supplier was to sell 50 barrels (before all production starts), what would be the minimum average price (per unit) for which she would sell that quantity?" Another reading, still vertical, is "assuming 49 barrels are already produced, if the average supplier was to sell a 50th barrel, what would be the minimum price for which she would sell that barrel?". The answer given by our linear usual supply curve says that the price is always higher than for a lower quantity is usually true, although not necessarily true for all quantities, which means that the true supply curve is not necessarily linear and positive.
***TEACHER RESOURCES*** Supply and Demand 5-day HS unit plan: mru.io/e92 Assessment questions: mru.io/principles-824af More high school teacher resources: mru.io/high-school-f8101 More professor resources: mru.io/university-teaching-0c342 ***CONTINUE LEARNING*** Next video-What Shifts the Supply Curve? mru.io/supply-curve-787a3 Interactive practice: mru.io/a45 Full Microeconomics course: mru.io/oh5