In the new era of competition, Is advertising or promotion of new startup enough ?

Now a days, Advertising, promotion is necessary as each enterprise want to inform public about their products. Some of the companies we have never heard, they do produce, bring goods in the market, they are not that well known to us like the branded ones. But a business to be in progress, the members must think of investing capital in bringing the wants and needs of public, that too having the lowest consequences later. Thinking of the social welfare, can be expensive but though a way to beat the established ventures. Promotion is a essential process for marketing. Improvement and satisfying public need is the way to success.