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You can enable or disable free agency during the preseason period of your league. This usually begins in early February. You can turn it off again in the future, probably during the same preseason time.
As a general rule, I have done simulations implenting free agency starting with the 1976 season, which is when it actually began. However, it tends to have too much of an impact in those early years, because it applies the current frequency of free agent movement to a period when it was very slow to take hold in MLB. It wasn't until well into the 1980s that we saw the level of free agent activity that we see today.
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