Why the balance of marketing mix is as important as any single element?

If the product is not desirable no market will want to purchase it.

Without a suitable pricepoint that meets the target market's expectatins the purchase will not take place.

Without adequate promotion, there will be no knowledge of the product.

And if the placement and distribution is not appropriate for the market, no one will know where to find it.

Therefore all of the basic four p's, product, price, place and promotion are important.