(Mishnah) Question: What is the Shi'ur of two meals for each person [for whom Eruv Techumim is placed]?

Answer #1 (R. Meir): It is the amount [of bread] that one eats in two weekday meals, but not Shabbos meals;

Answer #2 (R. Yehudah): It is the amount of two Shabbos meals, but not weekday meals,

Both of them intend to be lenient (this will be explained).

Answer #3 (R. Yochanan ben Brokah): It is a loaf one buys for a Pundiyon (one part in 48 of a Sela) when wheat sells for four Sa'im for a Sela;

Answer #4 (R. Shimon): It is two thirds of a loaf that is a third of a Kav. (A Kav is the volume of 24 eggs, one sixth of a Se'ah.)

Half of [such] a loaf is the size of a meal for Beis ha'Menuga. (If one stays in a house with Tzara'as long enough to eat this much, the clothes he is wearing become Tamei);

If one eats half of half (i.e. a quarter) of such a loaf of Tamei food, he is disqualified [from eating Terumah until he immerses].

(Gemara): R. Meir says that on a weekday, one does not have what to eat [with bread], so he eats little bread. On Shabbos, he has what to eat [with bread], so he eats much bread.

R. Yehudah holds that on a weekday, one does not have other food to eat, so he eats much bread. On Shabbos, he has what to eat, so he eats little bread.

(Beraisa): The opinions [of R. Yochanan ben Brokah and R. Shimon about the size of the loaf - HA'GAON RAV C. KANIEVSKY, SHLITA] are close to equal.

Question: See, [they are far apart! R. Yochanan ben Brokah] makes a loaf of [a 12th of a Se'ah, i.e.] 12 eggs, and [R. Shimon] makes a loaf of eight eggs, you say so (that they are close to equal)?!

Answer (Rav Huna): Deduct a third [of the price of a loaf] for expenses (e.g. firewood, and profit of the baker. The loaf is a third of a Kav, i.e. eight eggs.

Note: According to this, they are exactly equal! Some say that the baker deducts close to a third, so they are not exactly equal. If so, R. Yochanan ben Brokah did not specify the exact Shi'ur! Do not say that the Shi'ur is whatever one buys for a Pundiyon. If so, he did not give a Shi'ur for one who bakes his own bread! I answer that R. Shimon's Shi'ur is bread the volume of eight eggs; this does not equal bread made from eight eggs of wheat. If we say that the bread is about a third larger than the volume of the wheat (which seems feasible for pita-like bread from dough stuck to the oven wall, which does not rise very much), we can explain that the opinions of R. Yochanan ben Brokah and R. Shimon about the size of the Eruv are close to equal. - PF

R. Yosi bei R. Bun went out to bakers [and permitted them to deduct] like Rav Huna taught, as long as it is like this amount. (For a larger amount, the expenses are less - GRA Pe'ah 8:5. E.g. the same wood needed to back one loaf suffices to bake several loaves at once - PF.)