How important is the role of Marketing in Increasing the overall sales?

More then60% of sales is dependent on the marketing department of any company hence it clearly defines its importance in sales.

The Effects of Marketing are long lasting to boost the sales. Everyday the sales go on increasing whereas the%of the costs associated with marketing after reaching an optimum starts diminishing.  The strength of marketing determines the flow of revenues through sales.  It is how rivers are to an ocean.

Alignment between Marketing and Sales is potentially the largest opportunity for improving business performance today. When marketing and sales teams unite around a single revenue cycle, they dramatically improve marketing ROI, sales productivity and most importantly, top-line growth. 

Marketing is helping you to make your brand known to the people who matter (target audiences) marketing makes your audiencs aware about your brand/product/service! marketing is communicating your name & message and in turn enabling buyers to buy & take decissions !

Marketing vey important to send clear idea about your product or services to customes to gain there loyalty 

There are no second guesses to your question here. Marketing is absolutely important as that is what generates the sales in the first place.

But, one doesnt supercede over the other because both sales and marketing go hand-in-hand and need to work in perfect unison to achieve the goals of the organisation.

Marketing helps consumers to know more about products. Good marketing skills are very important for promotion and sales specially when you have competetive market. Marketing satisfies very first query of buyer i.e why I should buy this product ? A person with good knowledge and convincing power can help increasiing overall sales.

I am not a sales and marketing person but what I understand is that Marketing is the strategic part of operations which is sales. So in my view - very important. 

Marketing drives a consumer economy, promoting goods and services and targeting consumers most likely to become buyers. Higher sales for a business that employs successful marketing strategies translate into expansion, job creation, higher tax revenue for governments and, eventually, overall economic growth.

Any Brand/product sale 90% depend on marketing