Fibonacci and elliot waves.
The Fibonacci numbers are 1,1,2,3,5,8,13,21 etc you get the next number by adding the two previous adjacent numbers.
After the first four numbers,dividing any Fibonacci number by the one preceding it will yield the ratio1.618,and dividing any number by the number immediatly following it will yield 0.618
dividing any Fib number by the number which precede it two places yields 2.618
and dividing the same number by the one that succedet by 2 places yield 0.382
continuing in this way we get the ratios 4.236 ,0.236
these ratios are considered by elliot the primary determinant of the extent of price and time movements in any market