Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is buying a lottery ticket considered an investment? 
Although this has been touched upon in comments, I think the following line from the currently accepted answer shows the biggest issue: There is a clear difference between investing and gambling. The reality is that the difference isn't that clear at all. Tens of comments have been written arguing in both directions and looking around the internet entire essays have been written arguing both positions. The underlying emotion that seems to shape this discussion primarily is whether investing (especially in the stock market) is a form of gambling. People who do invest in this way tend to get relatively emotional whenever someone argues that this is a form of gambling, as gambling is considered a negative thing. The simple reality of human communication is that words can be ambiguous, and the way investors will use the words 'investments' and 'gambles' will differ from the way it is used by gamblers, and once again different from the way it's commonly used. What I definitely think is made clear by all the different discussions however is that there is no single distinctive trait that allows us to differentiate investing and gambling. The result of this is that when you take dictionary definitions for both terms you will likely end up including lottery tickets as a valid form of investment.  That still however leaves us with a situation where we have two terms - with a strong overlap - which have a distinctive meaning in communication and the original question whether buying lottery tickets is an investment. Over on investorguide.com there is an absolutely amazing strongly recommended essay which explores countless of different traits in search of a difference between investing and gambling, and they came up with the following two definitions: Investing: "Any activity in which money is put at risk for the purpose of making a profit, and which is characterized by some or most of the following (in approximately descending order of importance): sufficient research has been conducted; the odds are favorable; the behavior is risk-averse; a systematic approach is being taken; emotions such as greed and fear play no role; the activity is ongoing and done as part of a long-term plan; the activity is not motivated solely by entertainment or compulsion; ownership of something tangible is involved; a net positive economic effect results." Gambling: "Any activity in which money is put at risk for the purpose of making a profit, and which is characterized by some or most of the following (in approximately descending order of importance): little or no research has been conducted; the odds are unfavorable; the behavior is risk-seeking; an unsystematic approach is being taken; emotions such as greed and fear play a role; the activity is a discrete event or series of discrete events not done as part of a long-term plan; the activity is significantly motivated by entertainment or compulsion; ownership of something tangible is not involved; no net economic effect results." The very interesting thing about those definitions is that they capture very well the way those terms are used by most people, and they even acknowledge that a lot of 'investors' are gambling, and that a few gamblers are 'investing' (read the essay for more on that). And this fits well with the way those two concepts are understood by the public. So in those definitions normally buying a lottery ticket would indeed not be an investment, but if we take for example Vadim's operation example If you have $1000 and need $2000 by next week or else you can't have an operation and you will die (and you can't find anyone to give you a loan). Your optimal strategy is to gamble your $1000, at the best odds you can get, with a possible outcome of $2000. So even if you only have a 1/3 chance of winning and getting that operation, it's still the right bet if you can't find a better one. this can suddenly change the perception and turn 'gambling' into 'high-risk investing'.