Vertical Vegetable Growing

Interesting vertical vegetable system that Valcent products.

Excerpt:

A commercial module of one-eighth acre (5,445 square feet) is estimated to have capital costs of $565,000; using a wholesale price for leafy lettuce of $1.10 per head, may have gross annual revenues in excess of $1,300,000 with earnings before tax of approximately $505,000 supporting management's estimated 89% internal rate of return over 10 years.