In the first year of our marriage, a few decades ago, we paid $1.25 to see the incomparable Ray Charles in concert. No, it was not during The Great Depression. It was just the going rate for concert tickets (or some of them) at the time.

When Carnival introduced its Carnival Live concert series this year, the going rate started at $20 to see and hear performers like Lady Antebellum, Chicago, Jennifer Hudson. The concerts have been staged on Carnival ships while they’re in port, and they were so successful that Carnival Live will be back for an encore in 2015.

At a different going rate.

Tickets will start at $35.

The point is that, like almost everything else, prices are dictated by supply and demand. Carnival didn’t know what people who had already bought tickets for their cruise would be prepared to add to the expense for a concert, so the decision was made to start modestly at $20, up to $100 for a meet-and-greet with the artists.

Popularity has driven that price up, too. Depending on who you meet, it’ll cost between $125 and $250, according to our Ports and Bows colleague Phil Reimer.

The only common act from this year, so far, is Styx. Coincidentally, of all the 2014 acts, Styx (below) did the most shows — six. Will Kansas or REO Speedwagon or Lady A return in 2015? Perhaps, since only five shows have been confirmed…Smokey Robinson, Rascal Flatts, Little Big Town and Journey are the others.

That Carnival is charging more demonstrates what a bargain these concerts were in 2014. It also could mean even bigger names will flock to the ports as Carnival Live generates more income for the cruise line.

Supply and demand…remember?

Today at portsandbows.com: Hail Britannia!

Norwegian Jade
10 nights
January 14, 2015
Rome (return): Olympia, Athens, Ephesus, Istanbul, Naples
Inside: $499
Cost per day: $49
www.ncl.com