This good questions, and i like to answer it.
explain why there is no risk for early investors here?
Normally early investors buy the tokens at low price at the private sale or Pre-ICO, this always happen, and the next sales come with a higher price.
But the issue with this process most of the time the price of this token drop even under the private sale price or Pre-ICO price.
But with MUSD this will not happen, the early investors who invest during pre-ICO price ( 1 MUSD = $0.15) will be protected, due to we support this price.

How can you assure that your price will not be affected by the supply and demand in the market?
We do not control the price, the price can up or down it can be $0.2, 0.18,...or $1, $5, or even $100
we only support MUSD price at $0.15.
After Pre-ICO we run IEO (current stage)at MUSD price higher than Pre-ICO price start from $0.17 as in our case, so at this stage the investors who invest in IEO not protected, but we still protect early investors at price $0.15.
After the end of IEO many investors go to sell their token to get profit in this case the price may down (this normally happen), but with our project this will not happen, why?
Suppose the last price of MUSD for IEO is $0.2 so the early investors may try to sell all their token to get profit (around %35) after IEO once MUSD hit the exchanges, as the Pre-ICO sale is only 1% from public sale so, this will not affect the market price.
Another way to protect MUSD price, as you can see there are no any airdrops or free distribution.
And usually, the price falls below the preico price once a coin or token hit the exchanges, do you have contingencies to battle that problem?

In addition of what i explained above, we have another way to protect the price by offer to buy the price at $0.15.