The document discusses the author's career choices of farming or becoming a diesel mechanic. Their first choice is farming, which would require attending Ohio State University to study agriculture and earth science at a total cost of $181,044 for a 4-year degree. Establishing a farm would cost over $1 million for equipment like tractors and combines. Their second choice is to become a diesel mechanic, but the document does not provide tuition costs for the Universal Technical Institute program. Establishing a mechanic shop would require a $2,000 computer diagnostic tool. The opportunity cost of choosing farming is that the author would not be able to work as a diesel mechanic or on trucks.