Why does a serrated edge cut better than a plain edge?
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Because it’s serrated silly.
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Pressure Points.
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created by the angle of the serration…third coffee, brain cells are amped!!
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Any applied force concentrated on each point is far greater than the force would be when spread out on a single straight edge.
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An explanation I read years ago said that if you took two identical knives except for their edges, and could flatten the serrated edge, you’d wind up with a LONGER blade and cutting edge than the plain version. This is why a file-sharpened broadhead cuts better than a stone-sharpened head - as the file removes steel, it leaves micro-serrations for more “bite” as it penetrates.
Good answer! Better than mine!
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Now now, it’s not a contest. 
No but you win anyhow
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