Oh, so you are suggesting connecting the dots between the sales, but with empty dot so to speak to indicate there is no sale. That might be better, cause otherwise we will see this spikes when a trade occurs, rather than a line chart.
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Yes. Imagine the current price plot above if you deleted the zero-sale points. The line would then connect the closest days with sale.
Rather than draw an empty dot (a circle with a white interior), I think you can just omit the point entirely. Whether there is a point would be a bit more clear if the point size were increased.
Yeah, if you fill prices with the last-sale price, you'd get more of a plot that looked like it had steps. I sometime use "step" plots, but it really depends on what we think is the most accurate reflection of the data.