Legalization advocates also question why "trading" where one party has more information than the other is legal in other markets, such as real estate, but not in the stock market. For example, if a geologist knows there is a high likelihood of the discovery of petroleum under Farmer Smith's land, he may be entitled to make Smith an offer for the land, and buy it, without first telling Farmer Smith of the geological data. Nevertheless, circumstances can occur when the geologist would be committing fraud if, because he owes a duty to the farmer, he did not disclose the information (for example, where the geologist had been hired by Farmer Smith to assess the geology of the farm).