The value of things

We can see that everybody is unique and that we don't attach the same importance to things than as our friends or other people do.

For what reasons do we give we importance to things? Why (do we) buy something that allow causes* us to value [or "place a value on"] something?

We can grant [=ascribe] importance to something for different reasons. First of all, money is a very important tool [or "medium"] which serves as is a measure to evaluate [=gauge] the value of something. Most of people gives naturally give a greater importance to something which that is very expansive expensive. And this is normal. Except for the "stars" which who* have a lot of money, and can't detect [=discern or "appreciate"] the value [or "cost"] of the things, we are all working everyday to earn money. Indeed, to be able to buy the latest iphone we have to work and wait (and save). And this example could be another topic to debate, because, to get the latest iphone is not a priority for many people which who think that it only would be an impulse (purchase). However, technology can be an addiction for some people!

Furthermore, buying something is a way to value it, because this is a concrete action. The person realizes that this is a concession [=trade-off], he or she worked to have money and that in few seconds, his or her money will disappear. Maybe he or she'd better off buy another thing? This is a realisation.

Another means to of realizinge [=recognizing] that something is important, it's is when we lose it. This is the lack loss [=absence, void] it created which that also allow us to acknowledge (that) it was important for us.

Thank you!

Very good! "Which" vs. "that" is a common mistake even among native English speakers, so don't feel too bad. I'd say "that" is more likely to be used than "which", if only because we don't usually write clauses when they aren't necessary. :)

*"Regarding "Which" vs. "that": "That" is used when the clause restricts the meaning of the sentence. "Which" is used when the clause can be omitted without changing the intent of the sentence. Here's a good explanation of the difference from Writer's Digest: http://www.writersdigest.com/online-editor/which-vs-that

Also, "who" is used when referring to people (instead of "which").