Please explain to me exactly how exploitation is inherent in each of these situations:
Employment
rental property
charging interest
because I don't see how, in the absence of coercion, any of these things is bad.
An employer takes advantage of his employees' lack of capital in order to direct them has he pleases and take the products of their labor for relatively little in return.
A landlord takes advantage of his tenants' lack of capital in order to take what little they get from their employers in exchange for the use of shelter on his terms.
A lender takes advantage of his borrowers' lack of capital by charging them for the privilege to use his.