Samhail phraghsála sócmhainní caipitil
Is samhail cothromaíochta ginearálta í an Shamhail Phraghsála Sócmhainní Caipitil (SPSC). Is samhail sa staidéar airgeadais í an SPSC.
Thug William Sharpe (1964), John Lintner (1965) agus Jan Mossin (1966) an shamhail isteach (féach ar an leabharliosta thíos).
Tá an shamhaill bunaithe ar theoiric punainne nua-aimseartha agus éagsúlú ón obair Harry Markowitz (1952) agus James Tobin (1958).
Líne mhargadh na n-urrús
[cuir in eagar | athraigh foinse]Tugann an líne mhargadh na n-urrús an aisíoc ionchais ar shóchmainní :
![{\displaystyle \mathbb {E} [R_{i}]=R_{F}+\beta _{i}(\mathbb {E} [R_{m}]-R_{F})}](https://wikimedia.org/api/rest_v1/media/math/render/svg/0df6ec38a11f168e6ce02501f207b0412f612f6c)
an áit:
- an aisíoc ionchais ar shóchmainní ;
- an aisíoc ar shócmhainn saor ó riosca (mar bhille státchiste);
- an bhéite - an íogaireachta an aisíoc ionchas ar shóchmhainní don aisíoc farasbairr ionchais ar an bpunann mhargaidh, nó ; agus
- an aisíoc ionchais ar an bpunann mhargaidh.
![{\displaystyle \mathbb {E} [R_{i}]~~}](https://wikimedia.org/api/rest_v1/media/math/render/svg/74e8ee69d22b68be0725484eb2f083f7a04ddf42)
![{\displaystyle \mathbb {E} [R_{m}]~}](https://wikimedia.org/api/rest_v1/media/math/render/svg/eafaf2c49b2e53f3930399acb659f960fbaa26a1)
Leabharliosta
[cuir in eagar | athraigh foinse]- Lintner, John (1965). The valuation of risk assets and the selection of risky investments in stock portfolios and capital budgets, Review of Economics and Statistics, 47 (1), 13-37.
- Markowitz, H.M. (1952). "Portfolio Selection". The Journal of Finance 7 (1): 77–91.
- Mossin, Jan. (1966). Equilibrium in a Capital Asset Market, Econometrica, Vol. 34, No. 4, pp. 768–783.
- Sharpe, William F. (1964). Capital asset prices: A theory of market equilibrium under conditions of risk, Journal of Finance, 19 (3), 425-442
- Tobin, James (1958). Liquidity preference as behavior towards risk, The Review of Economic Studies, 25