(Wine-Searcher) - Given current economic conditions, the high rollers seem to keep wining across the globe.

Given the ever-higher stakes for luxury products across the world, there continues to be greater interest in luxury wines across all price points. However, surprisingly, there is still very little firm data out there as to what actually defines the luxury wine market.

Liz Thach, a Master of Wine and professor at the Rohnert Park-based Wine Business Institute at Sonoma State, undertook a series of studies. She compiled the results with her co-author Peter Yeung – another Master of Wine and vice president of strategy and business development at the Napa-based Realm Cellars – and is slated to publish them in a book, tentatively titled Luxury Wine Marketing, this fall.