Someone needs to make sure that it doesn't become a monopoly that hurts farmers and consumers. Bayer would have about a quarter of all the world's seeds and pesticide production, so with that much power, some agency would need to make sure they can't use it to hurt consumers and farmers.
Monsanto should be allowed to be purchased by Bayer provided a monopoly is not performed and adequate competition exist in the marketplace. Mergers like these should undergo an extreme scrutiny to ensure that consumers are protected and not subject to intentional, or otherwise, price-fixing that drives prices up without regard for the consumer.
No, two supergiants should not be allowed to merge because it prevents smaller companies from making money. The U.S. should ban monopolies, or at least break them up. Monopolies work against a capitalistic society because only one company will ever truly succeed. These merge is bad for the country's economy.
Monsanto should be stopped from acquiring Bayer based on anti-trust laws. The two will form a giant corporation that will be a monopoly. Combined, the entity would form the world’s largest seed and pesticide company. As a standalone company, Monsanto has already been investigated by the U.S. Department of Justice regarding a potential monopoly.