Good point!... I judge people's education by their "signature"
Ones signature alone it shows that persons level of education.
Many companies built plants where they got tax breaks and could employ in a "right to work" state. They later found out the expense of training people who lacked in education.
They were slow to learn = TIME IS MONEY.
2004-2005 Education Rankings
31 - Michigan
33 - Texas
37 - Kentucky
41 - Tennessee
44 - Alabama
47 - Mississippi
Perhaps to demonstrate your own fine education better, that sentence should be re-written: "One's signature alone [remove "it"] shows that person's level of education." Nouns which are in the possessive form require an apostrophe...