why do big companies introduce new products frequently ?

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as far as I have ever noticed , there are two major factors to explain?how come big companies introduce new products from time to time .

1st?the latest products exposed to the public will be capable of drawing attention of consumers , as a consequence sales will get improved which create economic benefits?, for example ,.....

2nd?introducing new products frequently makes a way for companies to establish and maintain a positive image among potential clients , since there is a sort of creativity or innovation to be found , for instance ,.....

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which one is better when making a complaint by talking or by writing ?

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from my perspective , it is up to?how severe the complaint is or who we?file a complaint?to when it comes?to how to do it .

1st?as for something trivial that can be?dealt with by someone familiar , talking makes a highly effective way to get the job done which is way more time efficient and handier , for instance ,....

2nd?in terms of something?big time?that can only be taken care of by a big man , I guess writing seems much more formal and convincing which gives receivers a kind of stress to take care of the issue?, for example ,.....

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