Could have bought fert early. Could have bought fert late.
Could have sold wheat early. Could be selling wheat now.
Could have bought feed early. Could have still got feed to buy.
Can buy spray in advance. Can buy it on the day.
Could pay a fortune for straw. Could look at alternatives.
Could have booked seed wheat early. Could be scratting around for it now.
Blah blah blah. Sorry chaps but there are plenty of mechanisms for agreeing prices beyond dealing on the day which may suit different situations. If your sole way of buying inputs or selling outputs is "I'll hope its a good price on the day" then more fool you.