OK, two responses, one to wiking and one to the OP:
First (as I'm sure everyone knows), the Russian economy was growing at breakneck rates in the years and decades before WWI, with GDP per capita, food production, and the industrialization sector all pushing going up and up. Now, it may not be fair to say "communism" stopped all that, since Russian modernization did continue apace in the late 20's, 30's, etc. (and yes, Stalinism did insulate the economy from the effects of the Depression, FWTW). But the way the Bolsheviks came to power, specifically the brutal Red Terror and the Russian Civil War, set back the Russian people and economy back the previous economic growth decades (plus it, by which I mean the war, caused one of the worst famines in Russian history).
So no Bolsheviks Revolution (or at least
not taking complete control), no Brest-Litovsk, no civil war, and no subsequent isolationism -- all mean the 1920's are
much better economically for Russia than OTL, so much so that even having their economy affected by the Great Depression wouldn't likely make them worse off materially.
Now, all that said, the OP is problematic -- speculating on if "the Kerensky Government hadn't fallen" overlooks a lot of issues with the Provisional Government at the time, and with Kerensky as a leader in general. I won't get into it here, but the best PoD you could give Kerensky in particular -- avoiding the clusterfuck of the Kornilov Affair -- would not be near enough to protect future events from his stupidity, much less keep a government that was supposed to be provisional in power.
Now, if you're not particular toward keeping that one guy in power, I do have some ideas for you.