The production of tomato concentrate, along with the wine production, was fundamental to Thera’s economy from 1925 until the early 1970s. The production of tomato concentrate used to take place within small family businesses until the establishment of tomato concentrate production factories. These factories are considered an interesting example of the industrial architecture of those times. You may see some of these factories, maintained in a condition of rather good repair, in Monolithos, Vlychada or in ABIS beach close to the airport.