The Total Revenue Test of Price Elasticity of Demand ( part 1)

By looking at how a change in price affects the total revenues of producers in a market (whether TR increases or decreases) we can draw some quick and accurate conclusions about whether demand for a good is elastic, inelastic or unit elastic between two prices. We'll also learn that even along a straight-line demand curve there is a RANGE of elasticities of demand for every good.
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I wish I had found this earlier, never bothered to use the resources internet can occasionally throw up.
Never seen a clearer presentation.

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but where can I find the full version of the song

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[@yashigupta7245]

Is total revenue not related with price elasticity of supply. We never look into the effect of total revenue with the elasticity of supply.why?

[@marine2262]

is this HL or SL i never know

[@benedictec6478]

it has math for paper three, so HL

[@MrCamelia65]

first