Explaining differences in P$/$E ratios $($LO $7-4)$

The price$/$earnings ratios of four companies from different industries are:

Company

P$/$E Ratio

Amazon.com

$83\mathrm{.}7$

Kroger

$6\mathrm{.}6$

Microsoft

$26\mathrm{.}6$

Toyota Motors

$7\mathrm{.}3$

Source: Based on closing stock prices on March $17,2019,$ and trailing$-$twelve$-$months earnings per share, both from Yahoo Finance.

Required:

What factors might explain the difference in the P$/$E ratios of these companies?