Even hardened marketers were left scratching their care-worn heads. It was pretty near impossible for companies to find space to promote their products in Delhi and Mumbai—India’s richest markets. For the past two months, all prime advertising space—in newspapers, on billboards and social media, you name it—were cornered by political parties, who unleashed the biggest ever publicity blitz in the history of Indian politics. And that formed just a fraction of the total cost of India’s costliest ever elections.