Question

how does old advertisement help us

Answer 1

advertisements help us by giving us an idea how the particular thing will work and by giving us the information about that.
old advertisement gives us information about that.
more explanation with examples is much better.

Answer 2

advertisment is the most attractive way to attract the consumer or to tell them the merits of the product .it helps that the people from worldwide see this environment. there are also some good messages in the advertisment.

the old advertisment and new advertisment tells more about the product. both are very essential or profitable for us