Idleness, contrasted attitudes of ancient and Christian civilisations
to, 137. 
  Income, unearned, approved by scholastics, 113.
      justice of, 198 et seq.
      socialist theory of its injustice not supported by scholastics, 214.
      recognition of, 212. 
  Individualism, of Christianity, 12. 
  Industry, development of, in thirteenth century, 15. 
  Ingolstadt, 211. 
  Ingram, Dr. J.K., 2, 3, 4, 12, 17, 18, 23, 24. 
  Innocent III., Pope, attitude to usury, 175.
    in favour of unearned income, 207. 
  Insurance, a contract of, 210. 
  Interamna, montes pietatis at, 196.
  Interesse proximum, suggested alternative term to damnum emergens,
187.
  Interesse remotum, suggested alternative term to lucrum cessans, 187. 
  Interest, justification of, 184. 
  Interest, laws regarding, in Rome, 160.
    taking of, disapproved by Greek and Roman philosophers, 161.
    see also Usury.
  Irish Ecclesiastical Record, The, 43, 47, 49, 109, 137.
  Irish Theological Quarterly, The, 9, 68, 128, 129, 130, 132, 135. 
  Isidore, 95. 
  Isidore of Seville, 15.
      his opinions on money regarded as final, 214. 
  Italian States, forced loans in the, 195. 
  Ivo, 169.

  Janet, P.A.R., 59, 61, 89, 91, 93, 97. 
  Jannet, Claudio, 183. 
  Janssen, J., 28, 68, 86, 125, 138, 139, 141, 143, 150, 154, 224. 
  Jarrett, Fr., 83, 84.
  Jeremiah, 165. 
  Jerusalem, the Church of, social system in, 44 et seq.
    St. Paul’s appeal for funds, 48.
    the Council of, prohibition of usury not imposed on converts by, 168. 
  Jesuits, the, invention of trinus contractus attributed to, 211.
  Jewish Encyclopaedia, The, on usury, 165. 
  Jews, attitude to usury, 160, 165.
    prohibition of usury between, 164. 
  John of Salisbury, 14. 
  Jourdain, 5, 14, 16, 149, 176, 183, 221.
  Jus abutendi, 87.
    divinum, 173.
    humanum, 174.
    naturale, 173. 
  Just price, a Christian conception, 104.
      authorities empowered to fix, 108.
      comparison of mediaeval theory with that of classical economists, 125.
      difference from modern competition price, 116.
      elasticity of, 117.
      factors determining, 109 et seq.
  Just price, fixed by common estimation, 115 et seq.
      fixing of, by law, 106.
      in money-lending, 179.
      mediaeval teaching on, 103.
      necessity for adhering to, 108.
      of wages, see Wages.
      rules for guidance in fixing by law, 107.
      nature of, 127 et seq.
      value of canonical doctrine, 123. 
  Justinian, rates of interest fixed by, 161. 
  Justinian Code, 28, 172.

  Kelleher, Father, 129, 130, 131, 132, 133, 134. 
  Knabenbaur, 166. 
  Knies, 80, 114, 135. 
  Koran, the, the taking of interest forbidden in, 166.