What If Plurals, "the", And "my" Forms Are In Domain Name?

[PoolMaster]

What If Plurals, "the", And "my" Forms Are In Domain Name?

[dennis123]

Me and a group of people are in the process of choosing a domain name for a future website and we aren't sure whether the noun in the domain name should be plural or singular.

Currently we have 2 options :

echangehec.ca (English: exchangehec.ca) OR echangeshec.ca (English: exchangeshec.ca)
livrehec.ca (English: bookhec.ca) OR livreshec.ca (English: bookshec.ca)
What are the advantages or disadvantages of choosing one or an other ?

Note: The funding for the project is minimal and purchasing both is an option that should be avoided if it's not necessary.