Columbia subject headings:
Charitable bequests--United States--Mathematical models.
Corporations--Charitable contributions--United States--Mathematical models.
Corporations--United States--Charitable contributions--Mathematical models.
Income tax deductions for charitable contributions--United States--Mathematical models.
Income tax--United States--Deductions--Charitable contributions--Mathematical models.
Voluntarism--United States--Mathematical models.
Harvard subject headings:
Charitable bequests--United States--Mathematical models.
Corporations--United States--Charitable contributions--Mathematical models.
Income tax deductions for charitable contributions--United States--Mathematical models.
Voluntarism--United States--Mathematical models.
Princeton subject headings:
Charitable bequests--United States--Mathematical models.
Corporations--United States--Charitable contributions--Mathematical models.
Income tax--United States--Deductions--Charitable contributions--Mathematical models.
Voluntarism--United States--Mathematical models.