1a) My personal experience is as follows: I purchased a laptop during a Black Friday sale for $800, which was originally priced at $1200. 1b) This qualifies as an example of consumer surplus because I was able to purchase the laptop at a price lower than the maximum I was willing to pay, which resulted in a surplus for me.

2a) My example of a positive externality experience is when I participated in a neighborhood cleanup event. 2b) This is an example of a positive externality because the action of cleaning up the neighborhood not only benefitted me and my immediate surroundings, but it also benefitted the wider community by making the neighborhood a cleaner and safer place to live. 2c) Economists would view this as market inefficiency because the market does not take into account the positive impact of externalities. The transaction only considers the immediate benefit to the individual participant, but not the positive spillover effects to the wider community.