It's always important to speak up at certain situationsSpeak up! Let the rest become aware if something is going absolutely wrong. It is always important to fight for injustice. I am not talking about any serious litigation or fighting physically with the muscle flexing goons at your locality but in general, there are many things happening around us to which we are ignorant. There are people who just avoid it thinking it will lead to an unnecessary argument.
For example, everybody is aware of the importance of manufacturing date and the date within which one must consume any packaged food item. It is mandatory to mention these dates. If someone is complaining to the shop keeper about selling products beyond the date within which it has to be used there are a few customers who will suggest nothing is going to happen if you use that product. This, in turn, encourages the shop keeper to store those products.
You can find a few shops, though not inside the market, selling items at a price which is one or two rupees more than the mentioned MRP. This is noticed mainly with the bottles of packaged drinking water or beverages. Many ignore this and pay the amount the shop keeper is asking. These are just two examples but there are many such small things which we ignore but can be stopped with our loud protest. So speak up. It's important in those situations.