# 870: Advertising

Explain xkcd: It's 'cause you're dumb.

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:The first line of the comic uses notation from {{w|set theory}} and reads out as: The {{w|Union (set theory)|union}} of {{w|Set (mathematics)|sets}} A and B equals the set of all x, such that x is {{w|Inequality (mathematics)|less than or equal to}} 15, or greater than 15, wich equals the set of all {{w| real numbers}}. | :The first line of the comic uses notation from {{w|set theory}} and reads out as: The {{w|Union (set theory)|union}} of {{w|Set (mathematics)|sets}} A and B equals the set of all x, such that x is {{w|Inequality (mathematics)|less than or equal to}} 15, or greater than 15, wich equals the set of all {{w| real numbers}}. | ||

− | :Below is a {{w|number line}} (with the numbers being interpreted as {{w|percentages}}) the black dot indicates that the number 15 is included, and the white dot indicates that 15 is not included | + | :Below is a {{w|number line}} (with the numbers being interpreted as {{w|percentages}}) the black dot indicates that the number 15 is included, and the white dot indicates that 15 is not included, but only strictly bigger numbers. |

* [http://thepiratebay.se/ Some things] in life are free. However, typically not those agressively advertised, with a capital "free!" splashed right over the ads, followed by a small asterisk, inticating the presence of a {{w|fine print}}, ensuring that they are only tecnically not guilty of {{w|false advertising}}. (Get a FREE* drink!) | * [http://thepiratebay.se/ Some things] in life are free. However, typically not those agressively advertised, with a capital "free!" splashed right over the ads, followed by a small asterisk, inticating the presence of a {{w|fine print}}, ensuring that they are only tecnically not guilty of {{w|false advertising}}. (Get a FREE* drink!) |

## Revision as of 12:06, 11 February 2013

## Explanation

This comic pokes fun at some advertising tricks, analyzing them mathematically.

- "Up to 15% or more" comes from Geico car insurance commercials: "15 minutes could save you up to 15% or more on car insurance.". Some afterthought shows that the statement is a vacuous truism. They could even safely go wild and exchange the 'could' for a 'will'. It
*seems*like they are saying something about the difference in the prices they offer compared to the prices of their competitors. The problem is just that "up to 15%" covers saving nothing at all, or even the scenario in wich they rob you of all your money and you "save" something like minus a few thousand percent (in comparision to staying with your current car insurance).

- The first line of the comic uses notation from set theory and reads out as: The union of sets A and B equals the set of all x, such that x is less than or equal to 15, or greater than 15, wich equals the set of all real numbers.
- Below is a number line (with the numbers being interpreted as percentages) the black dot indicates that the number 15 is included, and the white dot indicates that 15 is not included, but only strictly bigger numbers.

- Some things in life are free. However, typically not those agressively advertised, with a capital "free!" splashed right over the ads, followed by a small asterisk, inticating the presence of a fine print, ensuring that they are only tecnically not guilty of false advertising. (Get a FREE* drink!)

- The little formula Randall gives us, to calculate the least amount of money that they expect to make from you, doesn't quite make sense. The suggestion is that they expect their income from the ad to be more than what they paid for it. However, N*x/(N+1) is slightly less than x. A more apt formula would be x/(N-1). (*with the purchase of a $6 meal)

- Some sales are based on a scaling percentage rate - for example, all items are 20% off, but if you spend more than $200, you get 30% off instead, and so on. These are almost universally proclaimed with a phrase like "The more you spend, the more you save!" This is of course nonsense, as "spending" is the opposite of "saving", and the deal is there to make you spend more.

## Trivia

Randall changed the image name from advertising.png to mathematically_annoying.png, since adblocking extentions interpreted it as an ad and made the comic blank. He had had the same problem again just three months later with 906: Advertising Discovery.

## Transcript

- Mathematically Annoying Advertising:

- A ∪ B = {x:x ≤ 15 or x > 15} = ℝ
- [line graph representing the above equation.]
- When discussing real numbers, it is impossible to get more vague than "up to 15% or more".

- ["FREE!*" in large text, with substantial illegible fine print.]
- If someone has paid $x to have the word "free" typeset for you and N other people to read, their expected value for the money that will move from you to them is at least $(x / (N+1))

- [Graph representing inverse relationship between "amount you spend" on the y axis and "amount you save" on the x axis.]
- It would be difficult for the phrase "the more you spend the more you save" to be more wrong.

**add a comment!**

# Discussion

But the Geico commercial doesn't say up to, it says 15% or more... ~Jfreund

- That may depend on your region. 108.162.216.30 03:24, 30 November 2013 (UTC)