Chapter 24 - typo

[l-olson]

There is an issue on chapter 24, in the following paragraph

One last thing we should do besides showing the effects over time is to plot the counterfactuals to see if they are in a place that feels right. I know this is not a very scientific validation of our model, but trust me, it helps a tone. So here it is.

It should be

One last thing we should do besides showing the effects over time is to plot the counterfactuals to see if they are in a place that feels right. I know this is not a very scientific validation of our model, but trust me, it helps a ton. So here it is.

(tone should be ton)