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I have a very fundamental question. I am currently searching for an economic growth model with non negative investment. Can someone tell me if the Ramsey model is one with non negative investment and if so - why? Thank you very much

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    $\begingroup$ what exactly do you mean by non-negative investment? In most growth models there will be some positive level of investment. $\endgroup$
    – 1muflon1
    Oct 19 '20 at 18:54
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No it is not. The benchmark Ramsey model allows for positive and negative investment. Treating the case of non-negative (or "irreversible" investment) is considered an extension.
See Barro & Sala-i-Martin (2004). Economic growth (2nd ed)

  • Appendix 2B for a short discussion and
  • Section 5.1.2 pp 242-247 for an Endogenous growth model with irreversible investment and Human capital.

For a more deep treatment, see
Arrow and Kurz(1970). Optimal Growth with Irreversible Investment in a Ramsey Model, Econometrica, Vol. 38(2), 331-344 .

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Well, if you are talking about this

https://en.wikipedia.org/wiki/Ramsey%E2%80%93Cass%E2%80%93Koopmans_model

It is definitely a growth model (assuming consumption is less than output).

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