[Avodah] mishna rishona

[Rich, Joel]

The Gemara in a number of places (e.g., Shavuot 4a) uses the principle "Umishna lo zazah mimkoma" (the [original] Mishna did not move) to explain why two mishnayot might seem contradictory. (This earlier version is "no long operative.") Rashi (Shavuot) explains this principle on the basis of oral transmission practicalities-the generations after Rebbi could not "forget" the earlier one due to its being known in widespread "nodes." Therefore, they left both versions intact and assumed that it was clear that the later version was the primary one. The Ritva (Yevamot 30a) uses the principles as an explanation as to why the two versions weren't cohered (but sounds like they did want to keep the earlier version as well).
1. What's the purpose of keeping the earlier version?
2. If Rashi is correct, why wasn't the earlier version dropped when the switch to written vs. oral transmission was made?
3. Who changes their mind these days?
Kt
Joel Rich

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