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The role of informal microfinance institutions in saving

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from be<strong>in</strong>g <strong>in</strong>fluenced by <strong>in</strong>dividual stock risk, it is also <strong>in</strong>fluenced by other <strong>in</strong>ternal and<br />

external factors affect<strong>in</strong>g the general economy <strong>of</strong> the country (Nyamsogoro, 2001). Further<br />

argument is proposed by Palmer (1999) that an <strong>in</strong>vestor should identify specific risk to each<br />

asset and then propose suitable measure to manage it. Accord<strong>in</strong>gly, although the <strong>in</strong>creas<strong>in</strong>g<br />

number <strong>of</strong> assets reduces risk, there is a limit. Increas<strong>in</strong>g number <strong>of</strong> assets will reduce the risk<br />

up to a certa<strong>in</strong> po<strong>in</strong>t when the risk will be reduced further.<br />

Roll<strong>in</strong> (1999) po<strong>in</strong>ts the follow<strong>in</strong>g to be advantages <strong>of</strong> utiliz<strong>in</strong>g the concept <strong>of</strong> efficient<br />

portfolio. <strong>The</strong> <strong>in</strong>corporation <strong>of</strong> <strong>in</strong>terrelationship among different bus<strong>in</strong>ess entities <strong>in</strong> various<br />

economic conditions, the facilitation <strong>of</strong> optimization <strong>of</strong> earn<strong>in</strong>g-risk trade <strong>of</strong>f; and specific<br />

capital allocation pr<strong>of</strong>iles.<br />

Portfolio will be optimal when there is no other comb<strong>in</strong>ation <strong>of</strong> assets which give higher<br />

return volatility ratio. <strong>The</strong> large number <strong>of</strong> f<strong>in</strong>ancial assets <strong>in</strong>creases the change <strong>of</strong> hav<strong>in</strong>g a<br />

wider comb<strong>in</strong>ation <strong>of</strong> assets. In general, <strong>in</strong>vestors can <strong>in</strong>vest his funds <strong>in</strong> f<strong>in</strong>ancial assets<br />

registered <strong>in</strong> the stock exchange form<strong>in</strong>g portfolio, or <strong>in</strong> other economic sectors such as<br />

agriculture, m<strong>in</strong><strong>in</strong>g or general bus<strong>in</strong>ess sector.<br />

2.1.3: PORTFOLIO INVESTMENT IN THE CONTEXT OF TANZANIA<br />

<strong>The</strong> portfolio is said to be optimal if there is no other portfolio (comb<strong>in</strong>ation <strong>of</strong> assets) giv<strong>in</strong>g<br />

the higher return-to-volatility ratio. <strong>The</strong> large the number <strong>of</strong> assets one has the wider the<br />

alternative comb<strong>in</strong>ation will be. Hav<strong>in</strong>g <strong>in</strong>terested <strong>in</strong> construct<strong>in</strong>g a portfolio <strong>of</strong> a registered<br />

stock for example, us<strong>in</strong>g the Nairobi stock exchange (over fifty registered companies<br />

represent<strong>in</strong>g various economic sectors) are will be hav<strong>in</strong>g wider comb<strong>in</strong>ation alternatives than<br />

when one uses only four registered companies <strong>in</strong> Dares Salaam stock exchange (DSE).Even so,<br />

hav<strong>in</strong>g fewer registered companies or a less developed capital market does not necessarily<br />

mean it is not possible to form an <strong>in</strong>vestment portfolio. If for example, the f<strong>in</strong>d<strong>in</strong>gs (<strong>of</strong> 20<br />

stocks m<strong>in</strong>imum) <strong>of</strong> Newbould (1993) hold then it would mean that <strong>in</strong>vestors <strong>in</strong>vest<strong>in</strong>g only<br />

<strong>in</strong> Dares Salaam would never benefit from diversification unless the number <strong>of</strong> registered stock<br />

<strong>in</strong> DSE is equal or more than 20. Accord<strong>in</strong>g to Tanzania Investment Center, Tanzania has an<br />

important <strong>in</strong>vestment opportunity <strong>in</strong> M<strong>in</strong><strong>in</strong>g sector, tourism, fisheries, manufactur<strong>in</strong>g,<br />

pet<strong>role</strong>um and gas, f<strong>in</strong>ancial services, <strong>in</strong>frastructure development, and <strong>in</strong> agricultural sector.<br />

99

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