George Brock, the Saturday editor of The Times, said that all papers were looking for "killer" supplements with which they could attract younger readers. But he said it was hard to compete with digital media.

Berna Gonzàlez-Harbour, Sub-director of El Pais, said that a Friday supplement called Temptations had been very successful in attracting younger readers.

A member of the audience, Brock said that the weekend Times has separate advertizing sections for each supplement. He said some supplements, such as Health and Gardening, attracted very little advertizing, while other sections more than paid for themselves.

He went on that weekend papers certainly made enough money to be economically self-sufficient from the weekday papers, although advertizing packages were sometimes sold across the weekday and weekend editions.

In response to a question about how the weekend paper differed from the weekday paper, Gonzàlez-Harbour said that the daily paper was too stacked towards politics, and that it didn't yet know how to give space to different areas like science, culture or gastronomy. "We've been able to find that voice in the weekend edition, and perhaps we need to export it to the weekday edition too."

Another audience member asked if weekend papers sold better in Spain because the weekday papers had to compete with so many free papers. Gonzalez-Harbour thought not.

More news from the 59th World Newspaper Congress

And our video blog with Robb Montgomery and Visual Editors