Original sentence: Beer in Serbia and Montenegro (Serbian language: пиво (pivo)) is rarely mentioned outside of its state, regardless of its high quality.Beer is mostly sold in glass half litrebottles (empty bottles must be exchanged while buying or if not, bottles must be bought with beer as well); cans are less common and canned beer could be of slightly better quality.Common brands of beer include Jelen Old Gold.It is important to know a phenomenon caused by competition between breweries, most notably between the breweries of Apatin and Belgrade.Most beer that is produced is light beer.Some breweries also produce kvass or a similar drink.This beer is cheaper though equal in quality.When one brewery starts making beer of higher quality, more and more people start buying it; because of high demand the brewery begins hyperproduction of beer, and as a result of this its quality drops; meanwhile the other brewery, having low sales, improves the quality in order to atract customers; people switch back to it and the circle starts again
Edited sentence: Beer in Serbia and Montenegro (Serbian language: пиво (pivo)) is rarely mentioned outside of its state, regardless of it's high quality.Beer is mostly being sold in glass bottles of half litre (empty bottles must be exchanged while buying or if not bottles must be bought with beer as well); cans are rarer and canned beer could be of slightly better quality.It is important to know a phenomenon caused by competition between breweries, most notably between breweries of Apatin and Belgrade.Most beer being produced is light beer.Most people consider that the best beer in Serbia is Jelen, and the worst Old Gold.Some breweries also produce kvass or similar drink.This beer is cheaper while equal in quality.When one brewery starts making beer of higher quality, more and more people start buying it; because of high demand brewery begins hyperproduction of beer, and as a result of this its quality drops; meanwhile the other brewery, having low sales, improves the quality in order to atract customers; people switch back to it and the circle starts again