The Value of a Person - Behukotai
(ב) דַּבֵּ֞ר אֶל־בְּנֵ֤י יִשְׂרָאֵל֙ וְאָמַרְתָּ֣ אֲלֵהֶ֔ם אִ֕ישׁ כִּ֥י יַפְלִ֖א נֶ֑דֶר בְּעֶרְכְּךָ֥ נְפָשֹׁ֖ת לַֽה'׃ (ג) וְהָיָ֤ה עֶרְכְּךָ֙ הַזָּכָ֔ר מִבֶּן֙ עֶשְׂרִ֣ים שָׁנָ֔ה וְעַ֖ד בֶּן־שִׁשִּׁ֣ים שָׁנָ֑ה וְהָיָ֣ה עֶרְכְּךָ֗ חֲמִשִּׁ֛ים שֶׁ֥קֶל כֶּ֖סֶף בְּשֶׁ֥קֶל הַקֹּֽדֶשׁ׃ (ד) וְאִם־נְקֵבָ֖ה הִ֑וא וְהָיָ֥ה עֶרְכְּךָ֖ שְׁלֹשִׁ֥ים שָֽׁקֶל׃
(2) Speak to the Israelite people and say to them: When anyone explicitly vows to the LORD the equivalent for a human being, (3) the following scale shall apply: If it is a male from twenty to sixty years of age, the equivalent is fifty shekels of silver by the sanctuary weight; (4) if it is a female, the equivalent is thirty shekels.
והיה ערכך וגו'. אֵין עֵרֶךְ זֶה לְשׁוֹן דָּמִים, אֶלָּא בֵּין שֶׁהוּא יָקָר בֵּין שֶׁהוּא זוֹל, כְּפִי שָׁנָיו הוּא הָעֵרֶךְ הַקָּצוּב עָלָיו בְּפָרָשָׁה זוֹ:
והיה ערכך THEN THY ערכך SHALL BE etc. — This word ערך used throughout this section has not the meaning of דמים, market-value (which varies according to the condition of the market or the condition of the person offered for sale, whilst ערך is a fixed value), but whether he be of high value or of low value, according to his age is the ערך fixed for him in this section.
(ח) וְאִם־מָ֥ךְ הוּא֙ מֵֽעֶרְכֶּ֔ךָ וְהֶֽעֱמִידוֹ֙ לִפְנֵ֣י הַכֹּהֵ֔ן וְהֶעֱרִ֥יךְ אֹת֖וֹ הַכֹּהֵ֑ן עַל־פִּ֗י אֲשֶׁ֤ר תַּשִּׂיג֙ יַ֣ד הַנֹּדֵ֔ר יַעֲרִיכֶ֖נּוּ הַכֹּהֵֽן׃ (ס)
(8) But if one cannot afford the equivalent, he shall be presented before the priest, and the priest shall assess him; the priest shall assess him according to what the vower can afford.
על פי אשר תשיג. לְפִי מַה שֶּׁיֶּשׁ לוֹ יְסַדְּרֶנּוּ, וְיַשְׁאִיר לוֹ כְּדֵי חַיָּיו: מִטָּה, כַּר וְכֶסֶת, וּכְלֵי אֻמָּנוּת; אִם הָיָה חַמָּר מַשְׁאִיר לוֹ חֲמוֹרוֹ (בבא מציעא קי"ד; ערכין כ"ג):
על פי אשר תשיג ACCORDING TO HIS ABILITY — i. e. according to what he possesses shall he (the priest) assess him (the person who has promised the valuation), leaving him sufficient to live upon: a bed, mattress and cushion and tools necessary for his trade; thus, in respect to the latter, if he was an ass-driver (earning a living by carrying loads) he has to leave him his ass (Arakhin 23b).

Rabbi Yosef Tropper

Rabbi Moshe Feinstein zt”l (1895-1986) explains that each person has two values, one value is from being a part of the Jewish Nation and the other is through his or her individual talents. The laws of erechim stress that each Jew is precious and given equal opportunity to greatness. If someone promised to give the erech, Torah value, of Moses at age 120 and that of another simple Jew who was also a 120 year old male, he would pay the same amount. Each Jew is precious. If someone promised to donate the damim, market value of Moses, that would be an entirely different amount than for any other Jewish person. The value would reflect Moshe’s individual greatness. We each have a great value as members of the Jewish nation. We also have our own talents and greatness that only we alone have to share with the world.