I have always felt that the inflationary period immediately following the 'big bang' is a contrived theory, and this leads me to ask if the speed of light has always been the same figure. The reason I ask this is that to explain the initial rapid expansion, I wondered if the speed of light could have been virtually infinite at the moment of creation and subsequently slowed down on an exponential curve? I feel that this might be a more natural way to account for inflation. This would mean that speed of light continues to slow, although at the present time the change would be very hard to detect. If the speed of light must always be the same figure, why that particular number?