In this particular example, the optimal two-part tariff is a per-unit price of $1 and a fixed fee of $29. But notice that with this pricing structure, the Low-type consumer will not purchase any units of the product! Why was it optimal for the firm to set a pricing structure that intentionally shut the low-type consumer out of the market

The seller sets such high prices to increase his revenue. If he sets lower price, the revenue will also be less whereas high pricing will result in more revenue. Sellers sometimes set price as high as 800% above the cost. Though it discourages low type consumer but ensure high return by exploiting high paying capacity consumers. e.g. Apple (iPhone). Next it protects the seller from floating prices. Also by setting high price, sellers target high paying capacity consumers and increase their revenue manifold.

I like Kamala Harris more than Mike Pence. One reason I like Kamala Harris more is that she knows how to stand up for herself. During the Vice Presidential Debate, she stood up to Mike Pence in a polite manner. She also obviously doesn't support Trump, which is a big bonus. Kamala Harris will do better, leading our future because she knows how to set goals. Kamala is a U.S. senator representing California since 2016, serving on Homeland Security and Governmental Affairs Committee, the Select Committee on Intelligence, the Committee on the Judiciary, and the Committee on the Budget. I believe she has more knowledge than Mike Pence and more of a right to be a vice president. Mike Pence supports Trump, who is crass, rude, actively oppresses the LGBT, has predatorial/pedophilic tendencies, has 26 sexual misconduct allegations, says racist things, talks about having sex with his daughter, and has ties to Epstein, was bankrupt, and has no political experience.