http://www.techradar.com/news/best-40-inch-tv

The 40-inch TV size is an anomaly for most manufacturers. On one hand, they know it’s a great size for most folk’s homes. On the other, because TVs are becoming exponentially cheaper to produce, it just makes more sense to push people to a larger size.

The push for larger TVs can be frustrating if you’re looking for something smaller than 43-inches. Sure, they exist, but most of the major manufacturers like LG and Sony only offer one - maybe two - models in that range.