CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '9133fd86796ece6f',cH: 'oDkmAkHAHvj2iIIDBWtncRFSMuCgEahE60k0T478.5o-1739776569-1.2.1.1-.KGKbTLEcnOK4IY99Or1DINtFur9.m152nXJW1XZiGfe7_SQyTpIdTMZaTXtiKUk',cUPMDTk: "\/search?q=national%20economy&__cf_chl_tk=EglmTsLa.EOc84NDjYFXxWnNmyXRIMd2CRax301U7jE-1739776569-1.0.1.1-jSWvOA0qK7jUaTzs1Tqd_xBsC10s_FfCU8ulPBupACw",cFPWv: 'b',cITimeS: '1739776569',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=national%20economy&__cf_chl_f_tk=EglmTsLa.EOc84NDjYFXxWnNmyXRIMd2CRax301U7jE-1739776569-1.0.1.1-jSWvOA0qK7jUaTzs1Tqd_xBsC10s_FfCU8ulPBupACw",md: "CIRiS.FGOaTTPIkaDb5ABDzn4dzID.tN983vysJaaRM-1739776569-1.2.1.1-44MZab96pngCaJOu715y5orLdo7jzCLpIMsjzAcPVUko4Hys7Emgx_Gl1fYAXXBTYSLamFDVL3veEUBjzPgfrhBrF6vjXVUJI.Y_2mIhHHslOPVViOilm29j_zNE1D9eWN92J4ZX0LY69UpqjVjRn6EaENjgNmMV8srtupiMi9CcubWXEyfR63n9CmRN_tMqLCIyFlkByFVa8n6Wgardx8yXOYjjnebU2fbXJw9fV0Zro5gKLf8ZhaLA53sBf99ZwJaT_3hl14yYi5ocjyyNIrY2joa4dnjZ9HWdoGoxxfSAOx0h8h7iuNFlU4M5ZertYRxylgBGbLtBzmBSri4ZleIyFl6aU0HbTVEQVtcT3tS_T8mWFOO0nvBAweWX.wk61V9bpB3RIsGWN4GjVmmOs9bjLYTuyl3i.Ny5MCz2TK502PyD454kXMLCWQ.vT14eRTjRDcGZOR2oIv9XYs_rjchtC1jFaMPl7fQoIAMVW0llUABVuznHJPwQgdRrhwfaPjEQO.Ak_rhByDiV1LmHLLEU0y2JP6RDPo6pyJu6lG0Jg54O0..Je287jgfHo66CI7sE1ghY1xbuFyHF8A9bZlQTlsyhRwKZSaBJX285dqK71jECeAYR2tN26etQdQDRdhd3F3QTstPTJw4b1ybp9MttgoDDWZinTKe85MHKWYQBubNoIHGS__V9vumSkfYaIWhQ9AcGKTD4WXFOgKIWEqBTOr9p5Wokvx.p7bOSMno9NiJSQLPNsdTxxw9F1xYM6RQoYXhnQ29Z.YmFxP9oLtb8k9FxJd8JiYTKoBccKRUqmc99uQKqk6wNj_Y4hzo25WhTUK2VCj7AG5cfcsfloqfiQuod8B4nHhsMY2oqMkKI2MtqXbN9D5HU4p7Kl1ZiuruZhxtaY5DXJZsBVJG0_D4_vE7GY9EpmupJ_m9.L64EprM.vqQvAKNHnKv_MwXCJtKUc_X1a1Oh9fY1ONBeHmCwJ1EzV3T6D7_SIOcFwvfyeCwIpL4P8rGauAsH9KYkfSQ67Yey.y1Ofta1SLGFbaivYDZnO.6nGU9edopykotxp8UoJ1WnW1rLvecM7EQRRMIK7e71zrPYST8WspG3XSp4TLXH1af71jaFWmXhnGt_X5sN7rOdb2w_a2dKqIAOJzvapUygoqBQC3hriloYmMmnMuf4krEqCJw3uXfivcuD6Qa.4Gade5FMEP7jy96fsFDlBfNfadYGVkc6iaouLtlh8I6dFL.st5F_K8mnBhnBWltkiWd05nbTRcVE7lldu089icYBOxVbdk7LcSlwW4so2sfskioRtiZy7YORZJoc2U48mgJ4Hn9VNlLIeOnHLZm5zWY.F5dgL0zIDuM8i3d_FXzbhZge8J16JZpZwGbUjpA.A2UKaxm0xuyeCr8OCQXljjMs4ILEf1Jm7atKK8o8Hs5VtZ57lXa5rNOZKp8jF3hyvKr5NiBr0TMw1EkyLv.a6ts1xjQLN7CrPd7CWMQ09.Fj.T2zi1CKdwh.VnT0bZlXTPNhQmEwO81qsXE4A0JsPDrNiBRc8BgndxeezpPLMjkkbhuQkWn.8XJX3oDTHnEWmq2Vi3oA5kgOqQ788BeqA_4ZBI0vxWUl1OIMvW6FfzolhZDVFwOQQc.CfBbgUxpI8euLfTFnFEpXoBUawNHAvXoLy.FClZ1tG4AJPBNQozPHkWLLBCg7mkONz79eLhb6eJIp3s1i0rxbLlv5LYQCs8QiRMybQFWgnhbayxnDwaSeBXdVPijVsA3Ey9BR7S5KH.8NDMvmVcGzUJvycVCJPgz7tr.d2HbFJ12av0OVWFAIOqsjdSC9exypDrINZPReeKzahS1w1MD8tmbHBP0nFm87qWUrd4dP5BhTObN7bi6yNyoXjmj7FbmlrM_bdPeyFzqS3HnrNfxNbmi94QqYBUt9z262Ge2inDRIbg",mdrd: "JcdMhiH4sjrmGx8Vd8PX8ZMcU8LQ3BvtZiONHkAr.n4-1739776569-1.2.1.1-ZEfCI41cBLad4B70wT8Y6LrXI9ZF2U0BWQhJr2hyFmf9_xGn9lSPaqIs2MXoCJPs3bS8QI6_yU6FMc96PtT96Z7a86PjusaVrEFNuP2nC7WC_EgvhHRHkmr8uuDBanJvP2mqvsg4ZMqVOMpV0HaMzO6qMfOu1egECvvzhX5kGheigtko8EpgB1r8TCSBlw.CD.nkzP2vlWePvxMLOHYa6Th58Vg9s1t_oDyIJ_J0zvkrkXlsogvA2BzUtdycNnFwrG69CDIXRFY7Fd7jjVSDgfqndk40CMtdv1lH7J5b3Xh.bgCWZEMB1AnT1fex5jTwfcaB5Hic83Ost8wV_vXxuhHLWy9i5N0lXp2QL1o_cMfspBQTSnUPZw5B6HuzR.3K8wcDQnhCCRJ4hhgeiuPBsLePt1ikTzCBHuHIlZYQX4uGnNQ94UT7cutPkSSq03HZkm8qL4n9obz_px2Y_t56XYvA51DwNTIYuXZ13p2pDcEl1U6sa11d_tkYR1dYzwZnnQnnNVHUtCzJl0iI.YbV4rC_iR0SB.DmA9nvXRLt8HfxDJoP8SL8cDePCQQ_VGaM2lA8YItlxHaV7ONgtd.Oo3jq6Hqv7ZPts0bh6CIC_Q18jXdzAmZiI3INzfjPZnCfCiDu8MwmGv9tLOwa3yUhejAVyRZoFT1Re5YV_NvXWUI_ZXpBJQW0LJaI2OfZ9VrrVO48Hi6nxqDUf4Z0gBFoBnsMFiw6M8PVAb5P4kC2CHlk80GkxYrMANdwcD32_mZfiwMGAkg4qfWPrejw9TbqtwVNtAKKcye3kdXFYbraYHAhYMb5rT8myn5XSX4NDpHStglSNeFhOSHj.gmDfP6bQfPUx8bh7ComAfKKYGq1u5.nj74br7hgg5OKbVQ18OPM5sKoLTOMd3jTO9JYW.i6TRKNE.MUGzBvE12ITx.babVU61oDXnpj7KYLmFoaRnv1IjuRe4zRDTfnK.GlnwqHzlZAsbjsvqASUtw3oUqxg7KpYcZTOFTG8d6v_9RYiWQiTW_5vJjFLnPKUhqZ0iAY_s2JNUtCps2e070oULE82rj39qQVsr4Rk3AgPIX84PJ416SBoyW0v.TVVOGKurncJSVoRWOF.UUg50WYP0TwowDLAxSdlqGO_qdGyzLyJ15KT8.8k1R823.rt7DvWS62dS1vH05x8vKtt1K4_BlV9IZ4GbMC8F2kJcrf4UhoywzShHHg1sMXS7A09eeoNAaa4tka_WOI8X2NrAENJ9ulkoWL2G.AUPnA4DrDXp3NftzR7w8tyqLbh0ONK3c6NYR9I4wmnnS8SSyWD5omcs3yM52F.8D5cO6_dzGqW_Wbpc1boZGWciBCEakn5CmoNWs0nt5AVq9dmtuFuET3gS9y.SOHpBE5KNfypWER1SxffXFdVZgp_9N4ncBuTfNIPpk8s88sdbl4ZhGRknhc6jyPlbrTraRRDGglWYjIn3j17Ca8XEMasa4ci2r01Toj1b32QMBYvGlxvTkBp9e9u609ID.uCmrasq86oSye0EYvFFMuScO3YpkzGuIH_ZxVVKocCa7zjXFR.IzxHKmQr4X7D0tO_iPAXASbDQY8vCpaa1SMkHy7fqRQKD9liX7yt1uxgaLnj3qLkry0Bk7J6eP6k3yMQHgqa8EO0ygC22jU8LAtEFv0tpIBBUnm..J195JAwaz6aVhEyfE9sjyp6wvnQuyS.CxksxNbxIj27w7itinuife.l9oyhwtTOx0Fa31acZuoRoBpSg1WjNLBqBfeThVzrL63GbbLh8fi9ew6zxMPcLY27gfxPsjP39ql_Y8uU1GTvn_4RjCQ7n8goSrUEDTWqADuLPEhFb_cZZfgrjBAfqVZFHBusASx84kxLU.D_XRUsgtIYNXnQr_Qs2HHjn03sp7fCxtFY7QdEVNrzfkcuKAdGYDfIP4YtwQtlQYGKkpcc4dvLspaMHpUbExgwCIZbvSUXnhgtOoWYjPtLwJjtz9iZt9F7GpNQWusBK.ckA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9133fd86796ece6f';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/search?q=national%20economy&__cf_chl_rt_tk=EglmTsLa.EOc84NDjYFXxWnNmyXRIMd2CRax301U7jE-1739776569-1.0.1.1-jSWvOA0qK7jUaTzs1Tqd_xBsC10s_FfCU8ulPBupACw" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>