The central thesis of this paper is that globalization of security trading produce some serious fears about speculation impact on international finance. Umpteen of professional dealers make tremendous number of buy-sell operation. Other peoples suspect it jeopardize of financial parameters (prices, indices). In the reality the situation is other way round. The more traders, the closer to the ideal market. The danger could take place only when they lose they independence, for example by taking the same opinion about market movement and providing to similar attitude against market signals. Common, homogeneous movement is able to perilously swing with the market and create bobble effects. This dangers exists theoretically, like many other events and could encourage to consider some contra action. Nevertheless it means the intervention in multi-dimensional and dynamic system of global equilibrium, which results are not to foresee. Therefore one should evaluate the scale of such danger and probability of its appearing. The last dates don't present propensity of global finance to enlarge the volatility. Inversely, the beginning of this century bring visible stabilization on debt security market. The stock prices are continuing their irregular movements, but there is no evidence of rising their amplitude.