However, by the late 1960s there was market saturation and entrepreneurs sold into conglomerates or otherwise merged their efforts. The mid-1970s saw an increase in interest in sailing as oil prices began to climb following the 1973 Oil Embargo; however, with petroleum as a major component for plastic resins manufacturing costs also increased. In early designs the solution to engineering problems was frequently: just add more fiberglass. The early boats were sturdy but heavy. Many of the vessels produced during this time frame are afloat today, and several models still enjoy solid sales demand and exhibit excellent sailing characteristics; the Islander 36 is an excellent example of a boat from this era.